The only time ive ever needed to spend hundreds on a night out was when on my first boat it was the in "thing" to go to a "classy" strip club once a week and by the time youve been splashing out on £50 bottles of crap champagne, loads of dances, "private" dances

etc taxi back to base etc and you can then spend £400 in a night.
Although it is quite amusing when you go often enough that you just get waved in by the bouncers past the minions in the que and your on first name terms with all the girls who come over for a chat straight away
those were the days
but on a sensible night out i cant see how you go over £100 unless your a mug and buy everyone drinks!! Or your mad enough to live miles from town and spend £20 plus on a taxi each way