Hoe long before they need to close on the new home?
I'm in Jax too so there are some areas, price ranges that are a guaranteed sale in which case you could take the listing with no worries.
But yes, these "we will buy your house" companies will probably give your friends 85% of the list price (I may know which one you're talking about). If that's the case it may not net enough to put a downpayment or have enough money for closing costs (since most sellers use the equity for a downpayment, closing costs etc)
And yes, I would think you could get the name of the the "GUARANTEE" company & refer it to them for a referral fee.
Feel free to email me & we can discuss the companies involved. I may be able to better help you knowing which companies you are talking about.
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Tanya Watson/Owner
Sellstate Performance Realty, Jacksonville, FL