You need to give us more information.  When you ask can you build a good dice site for 30 BTC, you are giving us the impression that you are able to do something with the build.  If you are not able to do nothing on the inside to make this go other than put up the money, I do not think it would be worth your while.  If you are able to provide code or something like that, then you could make it work.  If you are just looking to have someone else do the work, do not bother, the professionals already have this covered.  If you can add to the project, other than money, lets see what you got; I have assisted others with less get further.