It's not too bad. All entrants are eligible for discounted kits after entering. I entered over the weekend. I'm not a skilled model builder, never built a Gundam, but this was a good opportunity to start.
So you have to buy the Gundam from them and if you enter you get a 10% discount? And if you want to enter the next contest they will take 10% off the kit you have to purchase to enter it?