1.Ok so I asked my LOR (Rabbi Reisman) this shabbos and he said that you can deduct the value of the points (how much they are actually worth in cash) from your maaser.
2. Now regarding giving maaser on your points he said that you do not have to bec of the fact that its just like a rebate and rebate are are factored into the cost.
3. We then discussed about getting bonus points for signing up and we decided that if its to offset the cost of a AF then it also is ok.