We also have a firm policy, always enforce late fees and deliver a notice to pay or vacate on the 6th.

the fee-based services seem worthwhile at least while actively looking.   

There's no charge to me to get these funds except a yearly fee of 200.00. 

Qualified renters can opt to pay a non-refundable monthly fee instead of a traditional deposit.

Your management fee is way too low, especially if you're doing everything for the owner.

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

Yes, those are the standard fees and pricing you'll find at most PM companies.

Can I charge them fees & rent for storage of their crap? 

You could buy about 80 of them, but your cash flow would still end up at 16k which is about what you are making now (actual it would be zero once you account for property management fees). 

But that wasn’t what the funds were for, they were origination fees - not prepayment for his time to go find a lender.