In my band, there is no group owned equipment. The individuals have bought equipment that the band needs and uses, but they still own it. We try to spread it evenly around, but also stick to the obvious... ie. vocalsists own their own mics, the guy whose home we practice at owns a small vocal PA, I own a Digi001 and computer, a kit of various mics (I'm the drummer and I also do walk-in PA work) cables and stands.
Basically if a member needs new equipment to enhance their own performance, it's up to them to buy it. Nobody gets any hire fees, but if anything has to be repaired, it's taken out of gig money.
If anybody leaves the band, they simply take the equipment they own, or sell it to other band members if that is agreeable.
We are in the situation where we don't own a performance PA. We hire professional production, so there are no "large" equipment outlays to worry about.