Price of over $9.99 is simply not good for indies.
If you think indies are so inferior to the classic that it's not worth to pay more than $10 dollars for them, just don't buy them. Or wait for a sale or the time when they will count as "old" games, too, in a few years and hopefully lower the prices then. Keep in mind these are newer games and part of the profit still goes to the actual developers, not just the publishers holding the license.
Personally, I'm willing to pay (a little) more than $10 for a new game, but it depends. I think $12 for a completely new release like Grimrock is awesome, as for Trine, most people probably already got it for less, but $10 is still a fair price, The Whispered World for $15 might be a little overpriced by now, especially considering the lack of multi-language support (you can get the original retail for less), but not by much. Anything up to $15 is still a fair price for a decent game with several hours of gameplay in my book, even or sometimes particularly if it's an indie game.