I never request donations or anything. Usually end up getting a nice tip (40-70pp). Best I ever got was 2 rubies for an evac to EJ. Other than when porting for CR, I think I got "stiffed" once.
I only port if I am bored or leaving the zone. Had people threaten me with various things if I was too busy exping to port them. For example, I used to exp in Dreadlands, and I would med inside Karnors when I was OOM (since it is safer than dreadlands). One guy asked for a port since "I was just sitting there". I said nope, sorry, I was medding. He said I was obviously lying and that he would never res me on his cleric.
You can make a good amount if you are porting from certain locations, though
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