I actually found the opposite, at least with the $5.99 games. I'm surprised so many people on here seem to be clamoring for games they already have, or have already played.
With the $9.99 games i have to be pretty sure i'll like it (at least at the current exchange rate), but at $5.99 i went for 2 games i've never played before.
Of course one was Fallout, which is universally acclaimed, so maybe not to much of a risk. But the other was a totally spur of the moment purchase of Hostile Waters, which i hadn't even heard of, and based purely on reading a good review of it on this site... i just wanted to try something different and new.
Plus many of the recent games i've tried have been ones that try something new (world of goo, etc..).
I've just got too fed up and jaded with many game genres.. i definitely DON'T want to play the same game/system again...

Very suprised you didn't include Ultima VI in that, I found that interface the most awkward particularly for combat, and what made it worse for me was that it was fairly intuitive, just rather slow and clunky until you got the hang of it.
It was the dungeons that got me in the earlier versions...

Ultima VI's never bothered me, I actually preferred the inventory system with its specific slots for items. The later system in VII required a lot of micromanagement to keep from getting cluttered.
Although I must say that one thing I didn't miss from VI's interface was the constant switching between characters to transfer items and fiddle with things in general, vastly improved in the immediate sequel and its expansion.
I agree about the dungeons in the earlier Ultimas, trying to find the path to the Underworld at the end of Ultima V was incredibly difficult.