"People are buying in order to then upgrade." Do you mean the people who buy the earlier copy at ebay, buy those because they want to upgrade after they've bought it? If that is the case, then there's no point in selling, since you can only upgrade once with a serial#. If I've bought P3 (which I did) and upgraded to P, then P5 then P5 (which I did too), I can sell you P3, P4 or P5, but you cannot upgrade!

Artwork and 3DToons items, create the perfect place for you toon and other figures!

http://www.renderosity.com/mod/bcs/index.php?vendor=23722

Due to the childish TOS changes, I'm not allowed to link to my other products outside of Rendo anymore :(

Food for thought.....
https://www.youtube.com/watch?v=pYZw0dfLmLk