$200/month divides into the $100K initial negative equals 500 months to recover the initial negative equity.Let's double the cash flow to $400/month.  250 months to recover the initial negative equity so over 20 years.Let's reduce the negative equity position to $50K (which likely is less realistic than expecting $400/month cash flow at that rent point), you are at over 10 years to recover the initial equity position.Now let's do it with all cash, no financing.The 50% rule state $900/month cash flow.  900 * 12/200K = $5.4% or about half of lifetime return of S&P 500, or what can almost be achieved with a zero work, zero risk CD.I see no way that someone who understands the numbers will call this a good investment.Note just because an investment is better than most other investments in a market does not imply something is a good investment. 

It can just be held in a savings account, no special account needed, but I always keep mine in an account separate from anything else.

[1]    You might want to think about opening 2 FDIC insured savings accounts that have no fees.

They calculate a "net effective" rent that's more appealing to the tenant, basically amortizing the concession over the lifetime of the lease.

I do all accounting for properties and company in Rent Manager. 

Good transaction accounting.

Cable, smart TV's and guests sign into there own accounts

Even with the recent rate increase of the last couple of years, f/f is significantly below S&P lifetime return.  

I find value in the 10k Club because it gives us lifetime access (without Subscription of $97/mo) to his tools for finding deals!

Did anyone in one of the accounts die?