There's a big bundle planned for the future, but it will also include upcoming packs that haven't been released yet. :)
I am not allowed to use the packs in more than one project/product. If I would like to do that, I need to buy the packs again, is that right?
If you use my graphics for multiple small projects nobody's gonna bother you. From my perspective that mostly applies if you have multiple high-profile products and in that case the price is inconsequential. So unless you're a big studio that's planning to get multiple frontpage games with these, don't worry about it. :P