On my listing, the agent simply said that there is a buyer's agent commission of x% on full price offers with no unreasonable contingencies.

Private Money/Hard Money is usually 10%+ but I think that may be unreasonable.

Respond with "We are not prepared to do that" when the tenant asks for something unreasonable.

So my wife and I are looking to purchase our first property, we looked into house hacking a duplex/triplex in the Portland, OR area and with prices the way they are in our area it's pretty unreasonable to get anything in our price range.

And, again, I am the unreasonable one because "all their previous landlords" let them live off their security deposit.   

Sure, some Guests are completely unreasonable (I've dealt with them) but the majority, as you mention, just want to be heard and felt taken care of.

Read Unreasonable Hospitality (Guidara), and let your imagination run wild.

A lot of people become emotional or unreasonable during the transaction process (you wouldn't believe how many times I have to talk people off a ledge over little things).

The tenant tried to toss a lawyer friend of his at me on move-out date, complaining I was being “unreasonable” and forcing him out of his home.

So much can be done online, and while you DO need to be reachable by your guests, you do NOT have to be reachable within 90 seconds, so don't feel hostage to some unreasonable standard of communication.