I wouldn't worry about people who think you are "taking advantage of the noobs". If you can get more out of them than they are worth without being dishonest because people don't shop around first, more power to you. That said, I don't think you have these priced too high or are being dishonest.
I recently paid $3150 shipped for mine with less than 1k miles Conti DW and TPMS. Retail on that setup is about $3800 so I got virtually new wheels and tires and saved $500 or so. That's good to me.
So I don't know what everyone is getting all worked up about. GLWS!