I had sent number of free stuff here on APUG and I even paid for the shipping as I knew the "buyer" had limited funds. After the package was delivered, there wasn't even a word of "thanks" or acknowledgement via emails. I'm quite surprised at this but oh well.
I will just do what I think is right and in good conscience/faith. People behave in strange and unexpected ways.
My point being.... you can't do things and make a decision based on what someone might do or think as they can be quite predictable. You only have your own conscience to follow.