I would consider buying "templates" - I have too many ideas, not enough time. I am primarily interested in making education software but I like to include mini-games or game levels within the design. If a template saved me a bunch of work then that would be interesting. I think the main problems are
1. how well is it written, can I extend and incorporate the code into my own project?
2. are there any game concepts available that take my fancy?
To be honest thinking about it while writing, I come to the conclusion that there would be a tiny market for templates - there would be a much larger market for coming up with custom templates. - i.e., writing to order. For example, I am quite keen for example, to include a jetpack joyride like level in my next program. I will end up making it myself but if I found a starter capx then that could potentially save me a few days of work and maybe I could learn something from whoever wrote it, or they did some nifty thing that I hadn't though of. Anyway, I am just thinking out loud.