Sometimes foreign investors just want a place to park money, and don't care much about returns. 

Depending on your tax returns, that might be an option.

What return would that money want?

My tax return was 62 pages long this year.

Your income, tax returns, etc have no bearing. 

I don't withhold security deposit returns for BS things.  

She may need to file a gift tax return for the $31,000 gift depending on other factors. 

They can offer fast results with relatively predictable returns.

Security Deposit: Follow Oregon’s rules—return deposits within 31 days with documented deductions.5.

If investors, you need experience and a strong understanding of how deals should be structured so that you can offer your investors adequate returns to meet their objectives while also having enough meat on the bone to be worth your efforts.