I think you're probably saving less than 1 life on average by being a donor.
U.S. websites tend toward overblown claims (100 lives saved per donor...) that have made it nearly impossible for me to figure this out. It appears there are 15,000 donors per year here, and around 28,000 lives saved, implying it's more than 1 life per donor (but not 5 or 10, as I had assumed).
I am currently signed up to be a donor, and I'm not really trying to wiggle out so much as figure out which option is better.
nods I tried looking at U.S. websites and found a pretty consistent "up to 8 lives saved" and anywhere from 40-100 that benefit from tissue donation. The big missing factor in my research was how often an organ donor actually ends up donating. Everything I read hinted at less than 50%, but I never found a firm figure.
Google needs a "-Propaganda" or "+Science" tag :)
An exercise:
Name something that you do not do but should/wish you did/are told you ought, or that you do less than is normally recommended. (For instance, "exercise" or "eat vegetables".)
Make an exhaustive list of your sufficient conditions for avoiding this thing. (If you suspect that your list may be non-exhaustive, mention that in your comment.)
Precommit that: If someone comes up with a way to do the thing which doesn't have any of your listed problems, you will at least try it. It counts if you come up with this response yourself upon making your list.
(Based on: Is That Your True Rejection?)
Edit to add: Kindly stick to the spirit of the exercise; if you have no advice in line with the exercise, this is not the place to offer it. Do not drift into confrontational or abusive demands that people adjust their restrictions to suit your cached suggestion, and do not offer unsolicited other-optimizing.
To alleviate crowding, Armok_GoB has created a second thread for this challenge.