The question's been asked about dues and benefits.
Well.....what do you want?
A newsletter?
A Tshirt? Possibly a remake of the Nuke the Moon Shirt?
How about an IMAfanOfrank j. Hat?
Lunch with Frank?
His home Telephone Number?
His daily schedule so you can stalk him? Hmmm, ok maybe that one's a bad idea. But Frank might like being stalked so he can go medieval on you.
Then we'll see about what it would cost.