Such a big difference?
That's crazy. O_o

Guessing somebody forgot a 3...

From MaGog's logs for 11 May:

NOTE! CHANGED Age of Wonders 3, reg_price_full, SE: $3.76 ***TO*** $34.58

Glad to help.

I'm sure the Swedish people love you. ;-)

I believe Cavalary's explanation is the right one.
I guess I'll go buy something at Ikea to compensate them.

From MaGog's logs for 11 May:

* Regional price for Braid is $17.30 instead of $14.99 in DK, PL
* Regional price for Braid is $17.29 instead of $14.99 in regDE, regIT, MC, NL, NO, SE, CH, regCZ
* Regional price for Braid is $15.99 instead of $14.99 in GB
* Regional price for Braid is $11.37 instead of $14.99 in AU, NZ
* Regional price for Braid is $5.18 instead of $14.99 in RU, UA, regUZ





* Regional price for Witness, The is $43.79 instead of $39.99 in GB
* Regional price for Witness, The is $42.69 instead of $39.99 in regDE, regIT, MC, NL, NO, CH, regCZ, PL
* Regional price for Witness, The is $42.59 instead of $39.99 in DK, SE
* Regional price for Witness, The is $30.29 instead of $39.99 in AU, NZ
* Regional price for Witness, The is $9.19 instead of $39.99 in RU, UA, regUZ

From MaGog's logs for 12 May:

NOTE! CHANGED Read Only Memories, price_hist: On January 27, 2016, price changed from $14.99 to $9.99 ***TO*** On January 27, 2016, price changed from $14.99 to $9.99; on May 12, 2016, price changed from $9.99 to $19.99

NOTE! CHANGED Read Only Memories, reg_price_full, CA: $9.99 ***TO*** $19.99
NOTE! CHANGED Read Only Memories, reg_price_full, RU: $3.69 ***TO*** $6.19
NOTE! CHANGED Read Only Memories, reg_price_full, UA: $3.69 ***TO*** $6.19
NOTE! CHANGED Read Only Memories, reg_price_full, regUZ: $3.69 ***TO*** $6.19

All other regions kept the previous price, which means that the current regional pricing scheme is:

* Regional price for Read Only Memories is $9.99 instead of $19.99 in AU, NZ, regAR, CL, CO, MX, PE, BR, regDE, regIT, DK, MC, NL, NO, SE, CH, GB, regCZ, PL, regRO, regRS, regCN
* Regional price for Read Only Memories is $6.19 instead of $19.99 in RU, UA, regUZ





NOTE! CHANGED Read Only Memories - Deluxe Edition Upgrade [DLC], price_hist: ***TO*** On May 12, 2016, price changed from $9.99 to $4.99

NOTE! CHANGED Read Only Memories - Deluxe Edition Upgrade [DLC], reg_price_full, RU: $3.69 ***TO*** $2.49
NOTE! CHANGED Read Only Memories - Deluxe Edition Upgrade [DLC], reg_price_full, UA: $3.69 ***TO*** $2.49
NOTE! CHANGED Read Only Memories - Deluxe Edition Upgrade [DLC], reg_price_full, regUZ: $3.69 ***TO*** $2.49

All other regions underwent the same change as US, which means that the current regional pricing scheme is:

* Regional price for Read Only Memories - Deluxe Edition Upgrade [DLC] is $2.49 instead of $4.99 in RU, UA, regUZ





* Regional price for Goliath is $23.07 instead of $19.99 in SE, PL
* Regional price for Goliath is $23.06 instead of $19.99 in DK, CH
* Regional price for Goliath is $22.99 instead of $19.99 in regDE, regIT, MC, NO, regCZ
* Regional price for Goliath is $21.89 instead of $19.99 in GB
* Regional price for Goliath is $17.39 instead of $19.99 in AU, NZ
* Regional price for Goliath is $15.89 instead of $19.99 in CA
* Regional price for Goliath is $10.99 instead of $19.99 in regAR, CL, CO, MX, PE, BR
* Regional price for Goliath is $5.89 instead of $19.99 in RU, UA, regUZ





* Regional price for Megamagic: Wizards of the Neon Age [Upcoming] is $16.15 instead of $14.99 in NO, SE, PL
* Regional price for Megamagic: Wizards of the Neon Age [Upcoming] is $16.09 instead of $14.99 in regDE, regIT, DK, MC, NL, CH, regCZ
* Regional price for Megamagic: Wizards of the Neon Age [Upcoming] is $15.99 instead of $14.99 in GB
* Regional price for Megamagic: Wizards of the Neon Age [Upcoming] is $15.16 instead of $14.99 in AU, NZ

[Yes. Currently the RU/UA/UZ price is still the same as US.]





* Regional price for Uprising 2: Lead and Destroy is $2.15 instead of $5.99 in RU, UA, regUZ

Wat. Usually, a game's price decreases with time if it changes at all. Have they perhaps done a major upgrade (e.g. got rid of the squeaking)?

Announced beforehand, there's some giant update coming that adds voice acting, fixes etc.

Probably this:
http://steamcommunity.com/games/330820/announcements/detail/887582442899131964

BTW, because of GOG's bug, the de-facto price is still $9.99 everywhere except US/CA (and of course RU/UA/UZ).
And US/CA get a $10.00 fair price package because the CN price is still $9.99.

Great news. I got the game on release but quit it because of the toothache-inducing voice effects (if you've played Undertale, think Flowey the Flower, except the latter is annoying for a reason).
(Well, the update is great news. The price fuckup isn't.)

Megamagic: Wizards of the Neon Age got released and it still apparently has no RU/UA/UZ regional pricing, as reflected by the first review the game has received.