First off, to the OP, I've bought from Perc.king llc. I don't remember what it was, but I know it went fine.
I've been on eBay for 20 years almost. If you're buying, ANYONE with under 99% feedback, I go and study their feedback. Sometimes it's just one negative feedback. Other times, the seller averages 6 a month/20 in a year (neg feedback), and I just won't buy from them. Picture quality and how many they include is important. If they mention a scratch or imperfection but don't post the pic, I message and ask why, or if they'll take a pic.
And the other great thing about ebay is, nearly all the really reputable stores sell there as well. Sweetwater, DCP, etc. I buy on ebay, I don't have to visit 5 sites to find what I need. Plus, you can just message someone or make an offer. I do that almost every time I buy vintage. Prices are ALWAYS jacked on vintage.
You just have to be careful. Early on, I dealt with a few scam type situations. But everything was always taken care of. I've never lost my butt, because someone ripped me off. Careful is the key word.
Here's an example of NOT CAREFUL. I REALLY wanted a new Gretsch kit. This was in November, probably black Friday-ish. I kept waiting to see a deal, a deal. . .some sort of deal. This seller posts a 4 piece Gretsch Catalina with a 20" bass, $499. NEW ?????? Wow. I instantly thought what IS WRONG HERE? Their feedback was 98%. He had negatives saying he sent broken items, etc. No way I'm doing this. But, I left it in my watch list. A couple weeks ago, I get an offer from the guy, $419. He knocked $80 off an already very good deal that was horribly suspicious. But, I could NOT, Not do it. I bought it. This is a Friday. Monday morning I wake up and see a message from the guy. Oh crap. He was getting it prepared for shipment and the 12" and snare were missing. I knew it. TOO GOOD TO BE TRUE. I got my money back quickly. But I truly shouldn't have taken the chance. He never found the 2 drums as far as I could tell. I'm assuming he already knew that, and tried to get me to bite on another deal. I did not.
Sorry for the length. I'm so bored right now.