... The problem is that the prizes are always an upgrade to the latest PRO version (A7 pro) or gift vouchers, which don't really help those that already have A7. ...
I agree. And I think it is not that difficult to offer much better prices. Look at the big contests out there. Some related companies could offer free software, 3d models, textures. Conitec only has to ask some of their developers. Maybe Fragmotion, Milkshape, content packs from Dexsoft, 3dTotal or some nice gamedev books could do the trick.