Our household income is about £50k and we feel really comfortable (cheap mortgage in the north and no DCs). But as I pay pension contributions, we have about £3100 per month to pay for everything, but we do manage to save quite a lot and have two foreign holidays per year.
The poster who has 'only' £2700 after bills need to realise that they are much richer than average. One thing that really irritates me is people that are much richer than average complaining about how hard done by they are. Most of the people I work with are much more well off than me, but you wouldn't think so, listening to them complaining.
However, posters are starting to touch on the reason why very well off people don't feel rich. One of the reasons why we feel so comfortable is that we lead a compartively modest lifestyle.
We eat or drink out maybe only once per month, mainly because I am a reasonably good cook and therefore I find the standard of food provided, particularly at chain restaurants, quite poor, to the extent that I do not want to pay nearly £50 for the pair of us to have a meal out. We don't have many good independants near to us either.
There are lots of things that are actually luxuries that have become normalised, so people do them without thinking, and can spend hundreds of pounds per month on, without realising, as they are simply just doing what 'everyone' does or buying what 'everyone' has. I mean things like:
latest smartphone contracts
lots of redecorating and refurbishing houses
regular beauty treatments
coffees and lunches out
regular meals out
whatever food you want from the supermarket and wine several times per week at home
prime cuts of meat (steak, chicken breast, fresh fish)
out of season fruit from Waitrose
new/nearly new cars
regular purchasing of new clothes
children's activities and days out to theme parks etc
I'm not saying that people shouldn't have the above, but its perfectly possible for a couple to spend hundreds if not £1k+ on things like these, without thinking that they have an extravagent lifestyle or room to cut back, when in reality they do.
Anyone on average and below average salaries won't be able to have these things all the time without getting into debt and will need to pick and choose to only do a few of them and then only occasionally.