If anyone belongs to these trackers can you answer any or all of these questions:

1) Is the torrent ratio hard to maintain ?

2) Can you avoid the whole ratio thing by donating? If so what is the minimum amount and is it a one time thing or a monthly/yearly thing ?

3) I always seed but my job requires me to be out of town for sometimes months at a time . How long before they consider an account "inactive" and start pruning ?

4) What would be the difference in buying an invite and buying an account to one of these sites ?

Thanks in advance . My only experience with trackers is UG and Pleasuredome .

1) Is the torrent ratio hard to maintain ?

BCG - very easy, due to the seedpoints system (you get upload to 1:1 for seeding a torrent for a certain time)
Bitme - moderate
Bitgamer - easy

2) Can you avoid the whole ratio thing by donating? If so what is the minimum amount and is it a one time thing or a monthly/yearly thing ?

BCG - yes, you can donate for upload credit (£1/3GB), and also donating makes the seedpoints system work way faster (it helps a lot actually)
bitme - yes, you can donate for upload credit, the minimum is $5 for 5 GB, the maximum is $100 for 375 GB
bitgamer - no, although you can't get disabled for low ratio if you donate.

3) I always seed but my job requires me to be out of town for sometimes months at a time . How long before they consider an account "inactive" and start pruning ?

BCG - 60 days unparked, 120 parked
bitme - 42 days
bitgamer - 90 days unparked, 365 days parked

4) What would be the difference in buying an invite and buying an account to one of these sites ?

BCG - you will probably get banned if you buy an account from outside your country, but there are currently no invites.
bitme - the only advantage of an account is the buffer (it probably won't get banned, even if you buy it without an email) - and the advantage of an invite is the lower price
bitgamer - same as bitme

If you have any more questions feel free to ask here.

edit: 100th post!

Thanks for the quick reply and good info .(especially since the NCAA tourney's been on all day)