Actually, now that I've checked out your sites ... good luck!
You've made a lot more progress than most that are seeking investors make!
It looks like you've already done a lot of work and are serious about this endeavor.
edit: IMHO, 50% is way too high ... what's preventing someone from buying great off-the-shelf software and doing the same thing? The most risk and work falls on the investor... Maybe just sell your software to others until you have enough to launch your own program?