I've noticed alot of people pay gil to get help. That's a straight out help right there. Offer enough for the help, then task complete. Although, for me, I did what yopop mentioned on alot of my characters, if I was in the zone, I asked people that were in the zone for help. If they didn't help, I'd just go do something else that I could do solo for awhile, and try again later. If you're stuck to where you can't move forward, like kazham keys, farm while you wait. There's many creative answers to getting the help you need.
However, none of anyone's answers seem to be putting this thread to use. You're wanting answers of what SE could do about it to see it happen. For early game, I don't see any real answers. But, let's say you're after specific bcnm drops. It would encourage people to utilize them if there was a set gil reward, so they know they're getting a reward each time they do it, even if they're trying over and over for a drop for YOU and not really aiming for anything for themselves.
Then, VNMs, gil drops, or certain nice equipment drops that are 100% droprate, would make those nice to do, even if the players just want to NPC them for the gil. What are some other areas you are wanting to look more into?