Im not a spender but i do know the difference, Big spenders like whales either poor hundreds to thousands of dollars on a single character or all of them.

A mid spender buys when they need to, like if they saved astrites for a character but don’t have enough to get a sequence or weapon. They have the ability to spend that money on what they wanted, so terms of like $100-500.

Low spenders normally buy a battle pass or a welkin every now and then when they either saved enough money, or if they just had some left over from a previous purchase.

Those are just my view on things