Using the SFR as an example, I could likely get a 2300 SqFt building with low quality finishes, basic architectural design, etc finished for under $400K ($175/sqft)However, if you had an ultra- high-end, luxury home before; you likely won't be very happy with what that $400k ultimately yields.

Have you read through The Ultimate Beginner's Guide to Wholesaling?

What you're sharing illustrates the need for a proven, consistent, reliable system that ensures prospective applicants follow the same process and rules across the board, shields you from claims of housing discrimination, and keeps you sane by pre-screening unqualified window shoppers from the qualified, respectful, long term tenants you ultimately are seeking yourself. 

I'd also recommend reading through The Ultimate Beginner's Guide as it gives you an overview on common strategies used.

What percentage of the ultimate sales price do you calculate for marketing, staging, realtor fees, seller fees at closing, etc.?

Eventually they realize that they need to act quickly, and adapt to my way of doing things, but it ultimately benefits all of us, because I can bring them a lot of sales at full commission and I do a lot of the work!

The ultimate goal would be to create enough income to not have to worry about retirement. 

I mean, ultimately, what's the point of purchasing a by and hold type property (assuming it is in ready to rent condition) when you are breaking even COC wise?

Check out the Ultimate Guide to Real Estate Investing!

Ultimately take action and be consistent!