What's the deal with all the "Donating" for ports?

[guineapig]

I get tells for ports, I say sure.
I port to them, they tend to just hand me X, then I port them.
If they don't hand me anything it doesn't matter because they didn't offer and I didn't ask. However, the only time this has happened to me was when people were on corpse runs.

I never advertise ports but I also never turn them down (unless I'm in a group and they are waiting on me). I never ask for money either (obviously) but considering how little I actually get to play I take the donation because it's often my only source of platinum during an average day.

On the rare occasion that I can't be bothered I /role.