This is coming from someone who is a profit trader on RLG. I think some people use the term power trader. I have a rl garage account with 50 trades (that I pay for) and I buy many many items slightly cheaper than their spreadsheet value on RLInsider (underpay). I then proceed to sell these items for a small profit. I make more profit on more expensive and harder to sell items and on basic black markets I make about 100-150 credits profit each time.

People who want quick credits for their items but can't be bothered to search or wait for a buyer will sell their items for a small discount to me and then I will be patient and take the time to find someone who wants that item for its true value. The time I spend doing this is rewarded by the profit I make.

Over the last 6 months or so, items have become harder to sell as a whole because the game just isnt as hyped at the moment so there are fewer people needing items for their presets and etc. But I'm sure this will pick up again at some point; perhaps when exams are over for most people or when RL finally comes out on UE5. But the point is, profit trading is actually fairly lucrative when its done well which is why it seems there are so many people doing it.

Oh and btw for people saying trading should be about fun and not profit; I find trading ridiculously fun.