then theirs charges 1000s in extra fees. 

I would also make tenants start paying water, as soon as their lease renewal comes up, with a flat monthly fee.

Condo fees $800 a month. 

I have a non-residential commercial mastermind and the fee started at $2500 in season 1. 

And, yes, there are years of data points to validate that just within my office, tens of thousands of dollars of wasted appraisal and inspection fees for deals (mostly not mine, thankfully) that had 0.00% of going anywhere but the "Loan Application Declined" bin. 

Spend a year learning and going to meetups before you fork over a $50-$100k franchise fee and half of your profits and don't even know what you are doing.

Would the investor have to use an assignment contract between him and new end buyer to collect the mark-up fee aka assignment fee at closing?

I don't think he would allow someone that had to put the fee on a credit card.

This is my first time buying a home and let’s just say I learned a lot about these fees.

I agree with the others here that say you need to have some skin in the game, if you are going to live there yourself, get an FHA loan rather than owner financing, you can get a 3.5% down loan, personally I do not love these as they require  PMI which is an additional expense, and you also need  bring additional funds for closing at least for taxes, title, attorney and transfer fees . borrowing from anyone else for the down payment, to include a personal loan from the bank is not a good idea, those again will be higher int. rate.