Tell me that Peter's not an idiot.
Organic webshooters take that problem away.
Peter's not an idiot. In the House of M version of events he made a fortune selling a version of his web shooters as a safe self-defence weapon. However, everyone knew he was Spider-Man so it didn't matter.
The problem is that if he sells this idea then it's a means of exposing his secret identity. All his enemies would have to do is find out who patented the idea and there you go - Spider-Man is Peter Parker.
And he can't just not be a superhero because of the "with great power comes great responsibility" thing.