Do you memorize where certain items come from?

Naaah, not really. My memory's horrible D:

I remember where some stuff are from

I don't think so well I have a really bad meromey too so lol I don't know if I am coming or going lol

most of the time, but usually memorize the stuff for my school

Yes, like if this items come from BVO or Pawlette's, I know, if they're a PSI etc.

Sometimes I do.
Like I know some items are PSI's, and some are just free gifts or fountain items :]

It makes trading simpler when I do -- get a better idea of item values.

Yeah, and you won't get scammed or anything or have to constantly look at the gifts section or something.

Yes, you really need to know this when you trade a lot, otherwise you could get scammed or something.

Definitely.

I haven't done a bad trade in a long while.

I can tell whats a PSI, fountain item, and like other. That I know.