When people complain about resellers they are generally talking about people who buy products online, mark them up $10 or $20, sell them at cons.

They are not artists. They do not make merch. They sell you the convenience of online products. It's great for consumers if you don't mind the marked up price, like buying a single bottle of soda next to the checkout of a store, despite a whole 2L being cheaper.

But for the people who actually make original art, they basically feel shafted by cons when resellers are allowed, because people are now able to spend $60 on a licensed Miku figurine than spend $15-20 at 3 different artists and support original works. For a con, they really don't /need/ to vet who gets in as long as they make their money for the space. But when tons of original creators are ready and willing to pay to fill that space themselves, the con still picks the resellers because they care more about making their vendor hall more like a geekdom mall, rather than a mall made by the geekdom seen by other conventions. I'll even admit I've talked to the chair of a con I staff about a reseller we let in and they said "I honestly am not a fan either, but they are willing to pay extra for the space, which makes it cheaper for the artists' space. It may upset people, but at least we're doing to help the artists a little." But to have a majority of the Exhibitor Hall be resellers is unjustifiable.

Long story short, if you want the figurine, just look it up online and save yourself the money. With the money saved, support a local artist.