Well the only polite thing to do is to bring your own towel and possibly a gift for the host.

I've been there before, to the tune of a $10,000 "loan" to an in law for a small business that ended up turning into a gift after just four payments.  

I'd consider you lucky to have been left such a gift.

Person A has fine credit, income is too low to qualify for a rental property in this area, would not be able to front any money if rental is vacant for one or more months, and 30K was a gift and not savings.Person B & C are married and looking to invest in a rental property.

But as a hobby why care just let it go.If your rentals are being operated as a business why would you gift someone money they are not entitled to. 

It not your job to come up with reasons why everything "might" work out, or transfer romantic dreams from a novel into the situation.Argh.  

In return, I gave my tenant a little monetary gift towards her move out expenses.

I could not disagree more with your 3rd point - why on earth would you want to reward bad behavior with a 3-month free rent gift?  

So, welcome gifts, for instance, are a bad idea in my opinion.  

If they are good tenants & pay their rent & don't trash the place, maybe as a "Thank you for being good tenants" gift, you could consider it AFTER THEIR CURRENT LEASE TERM IS UP.I wouldn't put in a disposal, though.