I understand suspicion but sometimes around here there's an insane obsession on wanting to discredit other users.
From what I see, if the competition's website says the truth, there are three prizes: 500, 200, 150 euros, plus a few other stuff like cd's and sheet music. Total value might amount to 1'000 euros or so, u guess.
10 euros per 500 participants in six competitions is 5'000 euros.
1'000 euros prize per six competitions is 6'000 euros.
Without considering possible miscellaneous costs, There's already more money going out then going into?
If so, this "money in the pocket" accusation, I don't see it.
This, of course, assuming that the prizes' value was more or less the same for each competition, and it is 500 participants in total and not per each single competition (in which case I immediately change my mind :-) ). This is at least how I understood it, might be mistaken of course.
Also, this is not an important world class competition, this is just an amateur thing and the approach here is to let users vote instead of judges, might like it or not but I really don't see why that should be an issue.