I think the BG provide VAS to customer is one of the easiest way to make them visit more frequently. But in the other end, customer is easy to get bored and want to get a new BG to provide VAS. At the end of the day, the BG is still can't keep the customer to book her! That's a bad cycle and the BG will be the biggest loser!
Personally, I would like to keep visit the same BG because of their dup skill which suit me. It takes quite a while for me to look for the right BG who can dup me comfortably. I don't mean other BG dup skill is not good but just not suit me! The most important thing, everytime I visit Windsor, my prime objective is dup but not VAS. If I want VAS or FS, I'll go to King's where can fulfill my need and it's cheaper, happy too! Understand some bro like to go to a place can provide all the service, but i don't think Windsor is the right place.
One interesting thing, King's has 2 type of BG - pure dup BG and non pure dup BG. I found the pure dup BG actually their skill is very good, even better than some BG in Windors. It's just the overall decoration in King's is much lower than Windsor. People keep saying King's is expensive but I don't agree with that. For 2 sections of pure dup + 1 section FS, the damage is around $1100 all inclusive. If I go to Windsors, 2 sections of dup already cost around $700-800 (included tips). $300-400 more can get FS too in King's which is very good price!
This is only my opinion, no offense!