I'm assuming you say the same about banks, right? Stealing is stealing.
So advocate paying a thief so you can save money. Seems righteous. Stick it to the big bad companies that employ and insure millions of people.
I'm not the one pointing blame. Us "scalpers" are apparently at fault for the rising price of villager cards. Forget the fact that the most important variable of capitalism is supply and demand. Prices wouldn't be so high if consumers didn't demand them.
What do you want Nintendo to do, send a complete set of 400 Amiibo cards to every single person as a purchase bonus? That's really the only "fair" way to do this.
But you're supporting a criminal. I suppose that's okay, right? There's a reason you have to resort to unmonitored sites like Etsy for these purchases. Listings like these don't exist for very long on eBay, at least nowhere near the volume they do elsewhere.
Judging by the responses, very few people here have ever dabbled in baseball cards. Topps, Panini, Upper Deck and the likes aren't going to produce more of a set simply because there aren't enough. Amiibo cards are an optional, voluntary aspect of Animal Crossing. You buy packs because there's a chance you can get the card you want. I bought 18 looking for Stitches, and I got him once. If Nintendo wanted to be fair, he would have been in all 18.
You can rationalize your immorality/unethical nature away all you want, but at the end of the day, the purchase you made is from someone that stole the data in the first place. It's your karma, not mine.