For instance I see "net income" and I don't know if that what the tenant paid or that's what I'm receiving after the property management fee.

If the hoa is foreclosing you probably also have taxes to pay and the first with default interest and late fees can be significant

MY LTR's are mid-tier for their market and have minimal cash flow at the moment so it all gets eaten up by  repairs and manager fee, my goal with these is mainly long-term appreciation and eventual cashflow as rents rise. 

Not sure of California, in Virginia, it might take 3 months of back and forth court visits before everyone is out.Maybe better to get everyone on the lease and assign clear, monetary fees in writing for violations.

It should be what it is now in which is the delinquent amount plus any additional  fees accumulated.   

If HOA fees, HOI Fees, and taxes haven't crumpled some it will.

buying and selling is also expensive - fees, fees, fees.not trying to be discouraging, just realistic. 

Charge a monthly fee, have multiple students at once all use zoom meetings, or even sell a course for a certain amount of money.DO NOT continue to tell people they will make $500k and that it cost $15K+ to do so. 

Who pays servicing fees?

You are making enough income to bring a check with you if you can't sell for what you owe + any fees.