One of the reason I've moved to oxwall was because of the prices of their custom plugins, is WAY MORE AFFORDABLE. Steven, have a look around at the other "Stores/Markets" of similar social network engines. I was using another one which most plugins are $50-60 and up. Plus there was a one time licensing fee for the actual software too. The main plugins I used with them (about 6 of them) cost over $600 altogether plus the theme I had was $200. The $5, $10, $15 here for quality plugins is quite fantastic.
I'm afraid if the prices here seem high, you might be in the wrong business.
P