* This is in London, which doesn't have the same "tipping culture" as the US. Sure hospitality jobs don't pay great, but both my wife and I have worked them in the UK and you can definitely get by without tips. Getting snippy about a drop in tips is nowhere near as justified here.
* We each bought a cocktail before ordering (£8 each x 6)
* As is becoming the norm in London, "optional 12.5% service charge" (good luck ever opting out of it though) was a separate line item on our receipt and it was calculated off of the face value.
* I specifically checked the terms of the offer and the menu options prior to buying the voucher. Despite choose from "the tapas menu" you actually get to choose from "the Groupon version of the tapas menu". The latter being about half the size.
* I left an extra tip at the end mainly because I know the economics for the merchant on running Groupon deals. In hindsight neither the service not the "special" treatment you get as a Groupon customer warranted it.
Because of their attitude I won't be back, that's the cost for making an assumption about me as a customer. I'm still undecided whether I'll use Groupon again though. Maybe seeing this insight into this restaurant was a good thing?