Heres few ideas.

Buy Exp scrolls with your guild marks
Simplely just trade players EXP scrolls of DoH,DoL,DoW,DoM. Each Class Selection = type of EXP scroll.

Weaver Guild Points= DoH exp scroll
MRD points= DoW exp scroll
Miner points=DoL exp scroll

Something like 5000 guild points for 1 tier1 scroll.
1000points=5000gil
Ifrit Totem= 20000points
Moogle Totem=20000points
Spirtbond+1 Buff (Lasts 3hrs)=500pts
Repair decreases rate -50% buff (Last 3hrs) 500pts
Meals Eaten +10% buff (Last 3hrs) 500pts
1000Guild Points Convert into 10 Faction Points
500Guild Points Convert into 100 seals