Seriously sir I am I bit confused with your explanation about the winning potential of bonuses and your original deposits, as much as I know, winnings is winning and the ratio in rewards is same both fr bonuses and your deposits balance, I may be wrong though but I think that is what it is in practice.
What is there not to understand. I have given examples of N500 deposit to win bigger amount and the N500 bonus which can only be used to win lesser amount. There was a time a casino gave me N500 bonus and I could only use it to win N150. Is that a big amount? Even with an accumulated (multiple) bet. But if I am using that N500 which less than a one naira, I can use to yo win more than $5 with accumulated bet. I hope this is clear now, or was it the currency spelling confusing you?
I may not know where this discussion originated from but I do know that some bonuses often come with some kind of limitations, such limitations could be in the area of games that the gambler can spend the bonus on, or a limitation to the max amount of money the gambler can use the bonus to win.
Personally, I've had a couple of experiences with bonuses where the casino limits me to some selected slot games, that is, I can't spend that bonus playing any other slot games aside from the ones selected by the casino, and I guess there was also a limit to the number of X's I could win on any of those selected slot games, like for example, if the max X a gambler could win on a particular slot game is x5000, with the bonus, the max becomes limited to x500 or something like that.
I do not know about other gamblers but I've had this experience on a particular casino a lot of times..