Quote -
I disagree with that comment due to that will jack up prices even more, and now days with the economy being so bad some people cannot afford higher prices. 

It should not be mandatory, but it could be a SERVICE the commercial site offers to its merchants.
It could actually improve sales, so I think it would good be for economy, not bad. Obviously the cost of such a service should be reasonable, given that products in the MP are more or less around $10 or $20.

But as Miss Nancy would say, "I ain't a lawyer". Neither an economist. So maybe it's a silly idea.
Giorgio.

giorgio_2004 here, ksabers on XBox Live, PSN  and everywhere else.