For instance, selling a $50,000 house and making $1,500 is not a very attractive proposition for an agent, but selling a 1 million house and making 30,000 seems kind of unreasonable as well.

If not, in many instances it does not end well: while hope everything goes good forever - always good to have a what if plan just in case

For instance, do you say that they shouldn’t nail anything to the wall and only use command strips?

there is no typical.. but in this instance going forward I would meet them and you hand them your check and they hand you the sign Lien Waiver/release. 

UNless you are running a full fledged business, in most instances (which still have not heard from someone how you could be sued) insurance is all you need.

That said, deductible would likely be $500 or more so how many nights would they need to get a hotel for instance and what would it cost?

But if for instance the old partnership is selling a property for $400K and the purchase price of the new property is $1 mil. 

.) , others not so much (mass mailings, for instance).

For instance - for a Conventional loan (not heloc), at a minimum, my UWs would take the most conservative approach and average this over the last two years.

What I mean is this Money market at Bank of America pays for instance 4%, the money market local Bank of Bricktown Pays 4.5%, an online outfit is offering 5%.