I will answer as best I can.
1. Not sure if anyone knows. I read a while back that MFSL presses a specific number of copies of each CD and then whatever supply is left after a certain amount of time is destroyed in order to preserve the collectible value of the product. I can't remember how many are pressed, it could have been 20,000 copies - for some reason that number comes to mind. There used to be a website dedicated to the MFSL discs, a FAQ page, but that no longer exists.
2. Don't know. This site has a pretty good list somewhere, with actual product numbers. There is also the GN'R collectible page,
http://gnrcollectibles.com3. Judging by what they go for on eBay I'd peg the value at about:
a) AFD $75-100
b) Lies $60-80
c) UYI I $140-175
d) UYI II $150-200
It's been a while since I looked at the prices so these are just going by memory. I don't think I'm too far off. Browse eBay completed listings and you should be able to get a good read on the prices.
4. 5,000 I think. Might be off by a bit but it's about that.