Looking through the LE forums I came across the discussion about why some BS's don't run. http://forums.anarchy-online.com/sho...d.php?t=556150
In essence it seems the following is/was true.
Low BS - TL2-3 runs occasionally due to people testing twinks for towers.
TL4 ditto?
175-199 doesn't run as people hate being ganked by 220's outside of BS
199-209 ditto.
Also if you refuse to join a BS or stay in queue too long ie join up and fail your loyalty bonus of 10 is reduced eventually to 0 then you have to go clear up garbage in borealis to restore your loyalty points...
This imho is a reason to lower the range that can be attacked outside of BS as towers dictate essentially the range people level their toons too.
It's also a main driver in balancing the professions within a proscribed level range.
However I would love to be able to attack level 75's with 200+ ahhh memories j/k
Gaming levels are therefore content driven. Lowbie BS towers, TL5 S10 and not being ganked by 220 (hence a mixed group of 150 and 165-174 in BS), and 175-209 towers. There is one exception 207 where you can gank 165+.