Actually guildleves are more like glorified fields of valor pages. I think they should make them non stop for exp, (the more ppl you have the better exp/sp you get per levequest) and have gil and other rewards once a day or game day. Levequest gives you a reason to kill mobs. Like an adventure should be. Maybe they can dress them up a bit better where you talk to the client also. Like you pick the guildleves go to the clients to find out what is going on. Have maybe a bit of lore to them. (and for repeated do what ffxi did and they will happen to need more killed to keep up what they need) example tomina topica (a lalafell miner) needs a mines cleared so she can mine a special ore that blacksmiths use to make special arrow heads for the archers of gridania. and he time you re get this guildleve she will say ya.. I need more ore and the mines got re infested.

weak example but basing it off of ffxi XD