Buying all these young strikers is the smartest investment you can make if you view football like that. Strikers are the ones who see their price inflate the most.
If Zaza does anything next year he could be valued at like 10M for all we know and we make a quick 6M.
And the other benefit is that if they're actually good, then wow, we are saving a lot of money on not paying an inflated price for a striker for the first team.