Where did u get this 10 Berth Quota Information???
I can see, 208/249 berth, which simply includes GEN+RL Quota!!
Even if all GEN Quota berth got booked, still the Remote Quota is intact & the Quota has been defined, coz BVI too do have dedicated demand!!
ST is far off & one Station option for ST residents, unlike Mumbai residents!
Further,...
more... 200 Berth dont create option for 70-80 berth clearance, as in that case, all trains with SL Coach, would get 100-200 WL cleared (provided they have 8-10 SL Coaches)!!
Quota is about Berth Availability & with increasing demand, no WL is safe!!