I'm not sure what the budget for most mobile app startups is, so I'm not sure if it'd be more reasonable for a startup to find some friend with a DSLR to take s

I'm not sure what the budget for most mobile app startups is, so I'm not sure if it'd be more reasonable for a startup to find some friend with a DSLR to take some shots for lunch or coffee (essentially getting something 80% as good as these, without the extra features of layers etc for approximately 10% of your asking rate). These freebies certainly look like they're high quality, though, and that's a start. Something that strikes me as way more important is that transforming a screenshot so that it looks natural in the hand of the model is probably the most valuable thing you can offer here. This means giving it some perspective (skew, rotate, etc...), right? Automating that for each image by providing a macro or something would really make these images more valuable in my opinion. Even text instruction rather than a script would be useful. I don't have Photoshop, and maybe Pixelmator is ignoring scripts such as these since it doesn't understand them, so I may be giving you advice you already know. If not, consider figuring out a way to package that, because that'd certainly make these images more useful (perhaps even worth more than $70, although I really have no context for stock photo value).