You do not have enough confidence in your application. You see how much of a hack it is. You worry that someone could duplicate it all in a Jolt-fueled frenzy. And you're wrong.
2.5 years ago I was terrified of the prospect of taking money and asked for some folks opinions on whether my software was worth $15, $20, or $25. In my heart of hearts, I was sure it would not sell even at $15. Someone convinced me to charge $25, at the least. I wish I remember who -- the decision has made me over ten thousand bucks.
And I'll be raising prices one of these days. People will pay them -- that is all I need to know to justify a price increase.