I think using a deposit model where they can get some those prepaid rate back upon closing is a good way to induce commitment.   

What fee do I have to pay to buy a slice of pizza with the Debit card linked to Coinbase?

Makes it easy to keep the cash organized as well as bills.You don't need a credit card but debit cards for each place makes it easy.

., you are capitalized at something like 250k and somehow got loans on the other 3.2-3.4MM For ease of the maths: If at the start you were to take your 200k and put down payments on 1MM worth of property (assuming zero closing costs, prepaid escrows, etc.)... you're tapped out. 

At a bare bones minimum, the letter confirms the start/end dates of the lease, monthly rent, paid-through date, absence of any prepaid rent other than the current month, and security deposit amount.Better, it will include statements there are no unresolved claims or disputes or repair issues with the current landlord, and no verbal or written side agreements.Better yet, it will include a copy of the tenant's lease, and a confirmation the lease is a true and correct copy with no amendments.

I was prepaid 1st 6 months of interest. 8 months have passed and no additional payments have been received.

I can have separate bank accounts, debit cards, security deposit accounts etc. and now with new features like automatic recurring transfers things are even easier and time efficient 

Check to X and I would even tell them you would send them a prepaid envelope usps priority mail

We allow Tenant Portal (ACH), Direct Deposit to our bank, Venmo, Strip (credit & debit cards) and old-fashioned mailing of checks. 

It also affirmatively states the tenant has not prepaid any rent except the current month, including any type of "last month's rent in advance."