Is there any chance that GOG will include support for Yandex.Money, and russian rubles in general?

Very, very unlikely.

Well, Steam it is then...

PayPal works pretty well with any currency - I never had problems with PLNs.

You can use Yandex.Money debit card for payments here actually. The problem with Y.M is that Steam is pretty much the only place you can use them and in fact you would be limiting yourself heavily with them,e.g. no humble bundles, indiegala bundles, bundlestars etc

GOG doesn't support rubles or any currency other than USD in order to be as transparent as possible in their 'same price worldwide' policy. Regional pricing is bad.

It only takes a quick google to convert (type in "6 usd in rub").

I can either pay directly with my debit card or use paypal, in both instances I'm paying using GBP (£). If I pay directly then my bank converts it automatically and charges a conversion fee. If I pay through Paypal, they don't charge a fee, but they make money by using a bad rate (so it's a few pence more expensive, but still less than what my bank charges).

No offense, but looks like you are just looking for excuses to pirate it :) Yandex.Money is providing perfectly valid debit card and there are at least two options to pay with it here (either by paypal or directly). Also, as far as i remember you can use QIWI card if you're looking to buy only a single game for here and don't really want to bother with physical plastic cards.

Of course, paying or not is up to you but for me personally absolutely single one game from here is worth the money - GOG occasionally sucks at tech stuff (e.g. linux support) but the way they're doing business is the most honest on the marker imho.

I'll look into it, thanks. They appear to also sell prepaid cards, which might be perfect for me

What's wrong with using bank-issued cards? There are a lot of banks that issue a virtual Visa, which you can use only for internet purchases. Transfer 10$ to it, buy a 10$ worth something and that's it.

You can choose who does the converting. My bank is better than paypal, so I set it up to charge me in USD (and I buy with a card on GOG).