I may be remembering wrong but I thought I remember a thread where someone from FC had posted it was supposed to be 10%, which is why I don't think it was community derived. Believe it was one of the threads where bot drop rate had been mistakenly nerfed...
Could be wrong though, but will have a look for it later
Edit: my forum Kung-fu is still strong, for an old man!
From Means himself confirming 10% drop rate, on ship gens at least, the way I read it but may be meant to include ground gens too
http://forums.anarchy-online.com/sho...3&postcount=43
So, not a random number out of nowhere, nor community derived either vhab!
Also found another thread where supposedly a gm actually relayed the 10% drop rate stat to players
http://forums.anarchy-online.com/sho...d.php?t=556535