I think there was about a stuff ton of knife sellers. not even kidding.
At the flea market by me, people go around the entirety of Long Island buying stuff, go to the city on Saturday and sell/trade/swap stuff, then come to us on Sunday lol. But anyway, as for the playboy magazines: apparently it was a thing to collect them a long time ago... so now, when all the old bachelors die and people buy out their houses, entire giant ass collections appear (pretty comical imo).
Knife sellers are just everywhere... It is one of those things that is a never ending market lol