That's what really bugs me about this. People who actually play these games and main these characters (like you said with Rosalina) are having trouble or just plain not getting their favorite characters because of scalpers and people who only care about these now because they're popular. I've loved Animal Crossing since the GC game and plan to main Villager when I get the game but because I couldn't pre-order his amiibo, I'm now SOL until NA sees a new shipment because I'm sure as shit not paying $30+ for one.
Not to mention Rosalina being an exclusive and the clueless people out there who think she's Elsa and buying her up because of that alone.
I wish you luck.
Bet they won't do anything but they need to know that this pisses people off