I'm in Windia, the land where no one levels (or at least not very many) so I've been unable to really test this at all, so I'm wondering if some other people in other worlds might be able to shed some light on it.
Basically, at least in Windia, during like 2X events the lesser drill halls are always cram packed with people (ever since they nerfed the one end map with all the knights) but the experience gains aren't really all that great (at least beyond level 210). On the flip side, I often like to go to the Ancient Golem map during 2X... but then I'm the only one there... like... ever.
It seems like the experience gains ~should~ be better with the Golems, but obviously I can't know for sure because there's never anyone to party with. So I'm wondering if it's a question of logistics or if I'm missing something completely.
Granted the map is a LOT bigger and there's no real safe spots... buuuut, my theory is that if you had an HSer and a Kanna, both using Sun Chairs on the left and right side, in conjunction with FOUR attackers with wide area skills (like Dawn Warriors or Xenons) that are at least 300k+ range... then in ~theory~ the experience gains should be significantly higher than the drill halls.
...but, like I said, there's not that many people in Windia with high ranges and/or who are interested in leveling so this theory is next to impossible for me to actually test. So I'm wondering if anyone has tried it in any of the other worlds and, if so, were the experience gains higher and, if so, how significant an increase are the gains?
It actually strikes me as a bit odd that more people aren't into leveling, since they removed the 999 cap on primary attributes. Granted leveling past 210 is a major pain, but the overall range increase seems to be quite worth it. I mean, going from say 210 to 220, that's like 50 STR (or whatever your primary) being dumped right onto one of your equips!
The only other means I've found to generate any worthwhile experience is from Mr. Lee's Island... mostly from the repeat quest where you collect the three items. If you conserve raptors (only killing one when needed) and basically spam the heck out of the up button on the portals until you get a white rhino, robot or raptor map, then you can easily generate upwards of 3% to 5% experience in an hour (depending on how lucky you get). I think the most I ever got was close to 4% at level 212 within the one hour time limit.
Oh, also, if you used a 2x quest experience coupon you could potentially get a LOT more... although I don't know if those work past level 200.