They should add a separate form of currency for the gang itself.
This could be used to buy things such as...
1.More room in the gang(this can be maxed out)
2.More ally slots(this can also be maxed out)
3.More gang rewards such as another ganghat that can be given out more mounts etc(would be your original gang hat or mount at 1.5k and 4k hours and the gang would have to have those hours to be able to buy the item)
How would this be awarded in way that doesn't break the reason for getting to those hours?
1. Being first at the end of the week for base hours awards you 3 Dgp(different gang points)
2. 2nd gives 2 dgp and 3rd gives 1 dgp
3. In gang spar, battling other gangs will steal their dgp and add it to your gang(the leader of the gang has to be present)
4. Showdown gives you 1/3 a dgp(this will spice up the competition in showdown)
Prices
1. Gang hat- 15 dgp(5 weeks of basing at first place)
2. Mount-18 dgp(6 weeks of basing)
Your ideas: