Well.. yes that would be a win for the artist. As would a sales tax that goes to artists, or a new law that legalizes pickpocketing for artists. Why is that a good thing? Why should an artist be compensated beyond the first transaction? If this concept took off, how long do you think it would take before Walmart begins taking a cut of every resale? They have just as much right to it as an artist.

If you don't tax resales, first auction will go for a higher price.

(Just like houses that come with less ongoing taxes or other burdens go for more money.)