If it works for you then its probably worthwhile and I perhaps shouldn't have slammed it in the circumstances. My partner and I blew over ?150 on a lobster dinner in France last year inc the most expensive bottle of wine on the menu - we were staying in a hotel with baby's grandparents who offered to babysit and it was our first night out as a couple for over a year since she was born so we didn't mind spending so much especially as we did have a good time. After all it averaged out at ?2 per week.
Put in your context , don't worry about the money, you both clearly deserved the treat! However personally speaking we'd prefer to get out of the house. And I doubt if any professional chef would put up with our kitchen....