Why do billionaires want/need tax cuts?

Okay I have genuinely always wondered this. Billionaires have money that they could never spend in their lifetime. Their kids and grandkids couldn’t even spend it in a lifetime. A billion is a shit load of money. So what good do tax cuts do? Do billionaires even feel any difference in their bank accounts, after taxes? I imagine that taxes are chump change compared to their total net worth. So why are they so desperate to give themselves even more tax cuts?

Not trying to be political, looking for a genuine answer that can help me understand lol

Edit: thanks for the answers guys, it seems like the consensus is that they’re simply greedy/hoarders/addicted to money. I don’t know why I expected it to be more complicated, lol