The underprivileged? They can go without? That is kind of an elitest statement, don't you think?
Honestly, I have seen most of these buckets being started at the same price they sell for in the parks when on eBay and then the bidding drives them up. The sellers aren't forcing anyone to buy them, the bidders are doing that themselves. Some of them have high reserves, but people still buy them. And obviously they are more than willing to do so. If Disney had a problem with this, they could resolve it very easily by selling these items online, which they do not.
As I said, some people cannot make it to the parks, yet would like to have some of these things. It brings them joy, and these personal shoppers in some small way facilitate that. Who are you to determine their sole motives and state what they do or do not care about? I was not aware that everyone had to enjoy Disney in the same manner.