I suspect backpagers buy the majority of my coins on bitquick.co.  it's nice because I can arbitrage the spread and buy back immediately at a lower rate on an exchange, but of course I'm really just selling my risk of getting my bank account seized in the event that some bureaucrat somewhere decides it's money laundering and retroactively applies the decision to me. So I have to constantly drain the account to minimize the risk. I also have to buy back in immediately to minimize the exchange rate risk because the most buyers come in during an uptrend.  A five dollar bump in three hours can wipe out any profit.

buying gas cards on purse.io is similarly problematic. I get a ~20% discount on the card, but I have to exchange the gamestop card for a shell card at a brick-and-mortar store which takes time and money, THEN I can only buy fuel at Shell stations which typically overcharge ~5% for fuel.

Once I have enough profit to cover living expenses, I crank up the premium I ask for on bitquick and crank up the discount I demand on purse.io.  If nobody bites, it's no big deal. If they do, that's less work for me in the future.

Arbitraging is the only way I know to make profits without burning through my stack, except of course lending out coins on bfx but the vig is still pretty low. For bigger profits that that, one must OBSERVE THE WALL and get lucky.