I had posted previously somewhere my ballpark numbers: The average guest in FPP days may have averaged about 4. I’d guess the average G+ guest may use 5 or 6 in a day. They will most likely still use some SB, for reasons of availability, not at a convenient location, etc. Just guesswork…
It is a factor, but not big enough to offset the 50% of guests using it, instead of 100%.