As mentioned, you do not have to place huge bets to be a high roller. A high roller is not just a single player who spends €100 a spin on the slots. They could be a player which spends €5 a turn over 20 spins on a slot. While we draw the line at players who spend €1 per spin over €100 spins, the truth of the matter is that a high roller is any player who spends substantial amounts of cash in an online casino over a relatively short period of time. Each casino will have its own terms as to what qualifies a person as a high roller. The amount you must spend is usually determined monthly.