I haven't played this game for about 2 years, and the only thing that's stopping me from coming back to this game is the pain to find a leveling party. There's usually 1.5k - 2k active players online. When you're trying to get 12 people to form a party, you're looking at 1% of the total active players online. I would say 60% of that 1.5k people are either merchants, or bots, or inactive player.
Currently only people within 15 Base Levels of each other can share exp. If you can raise that to 20 first (maybe 25), more people might come back and level and participate in ET or GVG. It could take 20 mins off from the time we spend waiting for a party. I waited for an hour today when I first logged back in.
This is just my thought.