We could each start new bank accounts where we each pay like 500 tu to open.
Interest begins as soon as an account is open, but of course the more tu we put in, the more interest is given to us. It can start off small, like 40 tu interest if you have 2k-10k in the bank and your interest increases as your account does.
We might also have levels of bank accounts that can be name anything like standard silver account or even triple omni account. It's whatever.
It's a little under-developed but it's similar to on neo (if you've ever played)
Basically I think this is a nice easy way to get a little tu here and there but it also encourages players to save and keep track of where their tu is at all times. Maybe this will cut down on support tickets about tu (if there are any) A history could prove if tu was stolen, taken out, spent, etc etc
just a thought o3o