I've only had the iPod Touch 4G for a week or so, and already I've spent $39 for apps..
Btw. I am not going to pirate apps from developers who charge only 0.99 or even up to $9.99, so I don't give a damn about install0us. These are reasonable prices, and I want to support them. Take Good Reader - it's 1.99 and an extremely useful app, so yes, I paid, and I was happy to do so. Btw., I'm not some goody-two-shoes - I've used bittorrent to get expensive apps for my iMac to try out... I'm not gonna drop $399 for an app only to discover I don't like it. So I like to try 'em out, and if they are really really good, I pay, even when they cost quite a bit.
But apps for the iPod/iphone? That's a no-brainer to me - I pay, and I'm happy to pay. To each his own, just my opinion.