I would say that this thread boils down to a few points. It honestly doesn't matter what your motives were for selling your cards. You did so in an unethical and illegal fashion. As has been mentioned before, shill bidding is essentially stealing from people. Why not just go out and pickpocket people for the cash? It also doesn't matter if you don't think that squeezing extra money out of people was wrong, as society as a whole has deemed it wrong. I'm sure there are murderers locked up in prison who didn't think that their actions were wrong.
You have alienated yourself from this community now, which represents a decently significant chunk of the larger collecting community. Your cards are rare enough that it is obvious which are yours, and now everybody knows that you practice shady business. This could end up causing people who would have otherwise bid on your cards to decide otherwise. Your actions to attempt to get some extra money may end up netting you less in the long run.
You have alienated yourself from this community now, which represents a decently significant chunk of the larger collecting community. Your cards are rare enough that it is obvious which are yours, and now everybody knows that you practice shady business. This could end up causing people who would have otherwise bid on your cards to decide otherwise. Your actions to attempt to get some extra money may end up netting you less in the long run.