Does this mean that the higher the amount we wager at a go, the higher the chance of ending up profit at the end of the day?
Or do you think it is all based on luck?, that is to say that the account with $5 on it wasnt just lucky today and thereby was unable to make any profit no matter how small?
Those considered luck-based games such as dice, roulettes, slots, etc. are following a certain algorithm where the final result is randomly given. The provided house edge, RTPs, and any related thing that intends to give casinos an advantage also plays a big role in the result of each of our bets.
Therefore, regardless of whether the wagered amount is high or not, that obviously won't have any effect on your winning or losing chances.
I don't see what's the connection of the account's current balance on why a user wins or not. It's just that those high rollers have a large bankroll that can last in a long run making it possible that on the way, they might take home the big win.