The rate will be high but you won't have to provide any income documentation or leases. 

I went to High School with the Mortimer family!

Lastly 30% is too high for a STR management company, especially one that says how often or how long you can stay at your vacation home.

For example, there are many networks and conferences of Ultra high net worth individuals at the billion dollar and up level that gather all over the world at conferences looking for opportunities (prior to Covid-19 of course).

I think this is simply the case of as you mentioned, seller not needing to sell but will if someone pays high enough today.  

Myrtle beach is in high demand, Matter of fact I am currently in an ocean front unit 10 min south of Myrtle Beach, Garden City, 

CC rates are too high.

I would highly recommend this be held by a title company if you are to proceed with another assignment transaction to better protect yourself. 

I highly recommend reading more about why S Corps are not the right structure for LLCs with rentals.

. :)    I HIGHLY recommend you Talk to Engelo he is from Aussie land and is quite famous on the Aussie version of Bigger Pockets thats how I met him in 2012 or so.. he has been investing and rehabbing in US for 12 years now very successful at it and a NO BS kind of guy..