I had heard that it was possible to pay the Hustler to stick stickers to yourself. Is that true? If so, how do I do that? I went to the Hustler in the Cash Shop, but the page didn't say anything about stickers.

You have to visit him in Pina Park on Atebus instead. Here's a direct link to the self-sticking page. It costs 10k per sticker

He still call it his "new office", even though it's a few years old now!

Awesome, thanks! I would have never thought to look on the moon lol

It's a marketing ploy.