[seanp2k2]

It seems like they could collect those metrics on the back-end (kitchen / food processor(s)) too, or use tip % as a proxy metric for QoS. Not sure how they'd track e.g. CTR, but straight conversions could be easy enough if you instrument the servers such that they're tracking clients per table. Of course, if you're trying to solve for optimal Drink Refresh Rate, you might need something more granular along the lines of sugar.

[ksk]

The proxy metric you're looking for is - did the bar have multiple hot women present at the same time as the customer.