Aiding cheating is against the honor code, however no one is going to say "sell me your paper so I may turn it in for a grade against the code".
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.
And if they want your paper so they can "see your thoughts" (and pay you for the privilege!?), what's wrong with that paper also being entered into Turn It In? After all, you surely don't think they were lying about their intentions. Because if you suspect they are lying about their intentions, then aren't you aiding cheating?
Well, actually you are still breaking the honor code even after you're graduated. Though the school would probably have little recourse against you in practice.
At least in my CSE program, you are not allowed to give anyone else the answers in any form. That includes talking about how you solved an assignment and it certainly includes sharing solutions for any purpose.
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.