I once guessed, but later I noticed that the facts do not check out, so I stopped. Though, of course, there's always employee rotation going on. In any organization.
This clears some things up, but it is still not enough. Also, certain facts do indicate it is highly likely "developers" are not spending their time developing L2, they have gotten lazy. I guess they know even less about how L2 works nowadays than before, and "having prebuilt serverpacks" would be a reasonable explanation. As well as the current slowdown.
(although NA/NCWest failed to deliver IO and had the exalted quest chain broken for like a month after release; tough times for all, I guess).
Thanks for the pointers, but I still stand by what I said. HF is a sort of a moral successor to IL, being loved without any good reason; so obviously, it can't be let go, just like IL was at a time. Time will pass and it will become old and worthless, and it will be given away. On the other hand, GDL is not a moral successor to anything.
GoD updates, on the other hand, made the game differ by large amounts between them. So it is arguable whether the base GoD pack is worth something nowadays, esp. considering that at least part of HF stuff was already removed at GoD release. Current L2 uses entirely different classes, SP counts, monster spawns and drops, item gain/enchant methods, etc. etc., although the monster AI is either largely the same or actually the very same as in GF (of course, for field monsters that already existed in GF). And obviously for people who don't really know how to play L2, this wouldn't say anything except "they want to take my precious".
On the other hand, not sharing anything is the best way to stay off the radar.