Stamp-wise it would be about 42 bucks per 100 letters.
42 dollars to educate 100 people seems fair to me. Nothing worth having is free.
Of course it is worth it if it helps win the election. The problem is $42 may not be alot to you but it is to some people. People seem to keep mentioning stuff like this about donations too. Like, "Why don't we have a money bomb for $100? Everyone can afford $100 for our freedom."
Just please keep that in mind that everyone has a different living situation.
