Seriously? I am 100% certain that selling papers for other students to use would have violated my university honor code. I would be surprised if there are any schools where that isn't the case.
Rather they'd say they want your paper so they can see your thoughts. That's fair because they could get the same effect from merely talking to you about your paper.
Or they'd say that its okay to use outside sources (such as your paper) so long as they cite it. This is also true in many cases.
In that case, you're not breaking any honor code although you're aiding others in being dishonorable to their own codes.
Thanks to a quick google, here's my old student handbook: "Selling academic assignments. No person shall sell or offer for sale to any person enrolled at the University at Buffalo any academic assignment, or any inappropriate assistance in the preparation, research, or writing of any assignment, which the seller knows, or has reason to believe, is intended for submission in fulfillment of any course or academic program requirement."