It might take a large financial institution with capital for “brainpower” and marketing, and financial and reputation strength to design as well as create a trading market for this type of security. 

As mentioned in a prior comment, a 401k plan does not require a financial institution custodian or trustee, unlike an IRA.The terms "plan administrator" and "plan provider" oftentimes mean different things to different people, particularly in the Solo 401k plan space.

In order to encourage tenants to get renter's insurance, we have been contemplating instituting a $50 monthly fee until they provide proof of renter's insurance with the owner listed as an additional insured, but not sure how well that would hold up if we ever had to evict. 

They are billed as "a scientific approach to single-family rentals" and use "institutional grade property management," which usually means they are a tech company in real estate and likely either don't have the existing property management relationships in each area or you chose an area where they don't have enough units through Roofstock for the PM they chose to care.

The pref layer is a third party institutional player.  

As for the point before you're first-- yes most folks think it's institution driving up these prices.

(so I hope).I have a whole lot more info regarding my interactions with these institutions and how I've dealt with them if you're interested?

.—(1) Whenever money is deposited or advanced by a tenant on a rental agreement as security for performance of the rental agreement or as advance rent for other than the next immediate rental period, the landlord or the landlord’s agent shall either:(a) Hold the total amount of such money in a separate non-interest-bearing account in a Florida banking institution for the benefit of the tenant or tenants.

Hard Money Loans are generally speaking institutional money so they make the rules and you either like it and take it, or move on to another lender.

He wanted me to paypal him 750 so that he would send the 20k needed to bridge the gap in the loan.While Facebook can be great to connect with institutional loan officers, mortgage brokers, etc.., true private money is a little more difficult in my humble opinion.