A member may leave a CC, and he'll find his CC XPs restored when he returns to the same CC. The CC loses no XPs and no level from leaving members.
An owner may only leave his CC by deleting it - there won't be anything to come back to. A new CC will of course start from 0 XPs and L1.
Tee selection - I'm guessing - may be bound to a certain CC level. ?perhaps L4?
It may be good for quick XPs or easy average progression, but it's negative for the competition. Higher tiers, released from their back tees, gain the shorter tracks as an advantage over the lower tiers, given their - usually - better clubs.
Also, ask yourself how much speed you might gain - are a few minutes per nine holes worth it?