There are ways to reward chores without money, and likewise there are ways to reward behaviors that aren’t chores. For example, when my oldest displays an unsolicited act of kindness or does something helpful out of the blue for their sibling, I’ll often toss over a few bucks to do with as they please.
The goal of the reward is to drive future behavior. We can choose which behaviors to reward in pursuit of that end.
To the OP, amount also depends upon where one lives and how wealthy or how desperately enmeshed in poverty they are. For millions, the very idea of an allowance is itself a luxury.