Yes, no doubt the goal is increased participation. And it's clear by now these 10EUR prizes aren't really attracting anyone. And why would they, when you have to invest at least 100 to get something worth entering with?
Also, there are so many contest running at any time across forums now, AG appears to be falling behind. Noone's going to "waste" a 1,000x winning screenshot on a potential 10-25 EUR prize unless they are in it just for the spirit of competion, which let's face it very few are.