I think it's a great idea. I'm not a shopper, and I ALWAYS get sucked in by the bake sale when I'm forced to tag along with flea marketers and yard sale hoppers. One clever way of selling baked goods for a decent profit is to sell small bags of cookies (3 or 4 to a bag) instead of trying to sell them one at a time. I don't know what the going rate in your town is for a good brownie or cupcake (if you're using a boxed mix and canned frosting, I wouldn't gouge them too much or they'll feel ripped-off). I found a great cupcake shop in NYC that makes excellent cupcakes from scratch and they go for over $3.00 each--but they're WORTH it and there's a line out the door. If you're going to charge a lot, make it worth the price!
p.s. I love coconut, but a lot of people don't. Make more chocolate/vanilla; they're crowd-pleasers.