Personally, I couldn't justify using higher-resolution apps (Or HD as is the popular term), and then there's the fact that they bump up the price quite a bit for no particular reason in my mind.
Most ipad apps are around $5(Correct me If I'm wrong) and ipod touch? Many of them are free or very cheap and great as such.
To put it simply, I'd rather have an ipod touch/iphone over an ipad firstly for price (Obviously for you that isn't a problem but It would be for me, and I still couldn't justify the price difference) Secondly because it fits somewhere meaningful (as has been said before, the Ipad is too big for your pocket, but not justifiably big enough for your bag in most cases) and lastly because I don't need a high resolution screen that's difficult to hold in most cases. The only reason I would want something 'bigger' would be for reading, and there you could get a jailbroken kindle or something of the sort. To me it's just one of those things in between the smartphone and the netbook that I would really have no use for.
If I had a soft spot for apple stuff, I would probably be more kind in my opinion, but I don't.