BarkerJr: that's exactly what we can't do
we can say "thank you for running a relay from (start date) to (end date), you've helped provide online anonymity, privacy, blah, blah, blah..."
but the person doing the deducting has to value their donation, not us
because it's a conversation between the person and their tax authority
"i donated a tor server valued at $1 billion us dollars in 2009" irs> lol, try you paid $100/mo for 2 months. denied! welcome to auditland!