How many or how much
The question is itself irrelevant but comprises a lot of thinking that should be done around it, and on behalf of any dump shop, but if one is shrewd enough to see through the dense foliage of the torn trees they as well might see an answer in the middle of their puzzlement.
Legitshop and all the similar can offer an inexplicably atticing deal, and you would go thinking for an extended period of time, how much you will get from every cent invested into it, but the trap is just the other side of the coin.
The real concern is to be calculating, and you better be precise and adequate in order not to miss a minor detail, how many times mrwhite or others will call at your door. Because it is easy to grab one hanging near the ground bunch of juicy fruits, but what is coming after could be a rotten hell.
First of all, a validccseller should always offer you a guarantee of being able to provide you more of the same goods for relatively the same price, of course there might be small fluctuations on the market, but still, it will have to fit in a certain range of prices.
In any case you will have to be your own rescator and have your nose up and working, letting alone the question of whether what you are doing is quantifiable right now, or might it be repeated, which is the ideal scenario for anyone.