It comes down to what you want to spend your money on in my opinion. There's no point making a fortune only to end up living in poverty whilst the $ pile up in some account.
Many other common things could easily be viewed the same way. For example:
Nobody needs to ever drink beer. Water is cheaper and better for you. Drinking beer is totally illogical from a financial perspective.
Nobody needs a big TV. We all lived perfectly well until very recently without them and I don't recall anyone complaining that a 63cm set was too small 20 years ago. Taken to the extreme, you don't actually need a TV at all.
Renting a seat on a bus for an hour each day is generally a lot cheaper than owning even the smallest car. Many households don't actually need a car at all and most could survive perfectly well with a single 10 year old 4 cylinder with manual transmission and no air-conditioning. But stand on any street corner and just watch $ millions pass by in 4WD's that never go off the bitumen and Jap imports with a fortune spent to make them look different. It's a personal choice but financially it makes no sense.
What sort of monitor are you reading this on? If it's anything more than a 15 inch CRT then you've spent more than you needed to. Nothing wrong with that, it's a personal choice, but it wasn't long ago that we all survived perfectly well without LCD's.
Own a mobile phone? Anyone over 30 will remember quite well when the very concept was science fiction. Most will also rembember quite well realising that it wasn't that often that anyone really
needed to make a phone call when not at home / work / near a phone box therefore it wasn't really necessary for anyone to invent the mobile. If it was ever invented then the only obvious use was to leave it in the glove box in case the car broke down - you certainly weren't going to carry the thing around with you all day.
There is now close to one mobile phone per person in this country, that's more than one for every adult, and a large portion of those don't make a profit for their owners. People choose to spend money on them however and it's increasingly seen as somewhat weird not to own one - much like how smoking was viewed 50 years ago.
On the subject of smoking, that too is completely pointless in a financial (and health) sense. Many still do it however and quite a few would have taken up the habit for the first time today alone. A total waste financially, clean air is free, but many still choose to do it.
Ever bought bottled water? Probably the most pointless product ever mass marketed when better quality (and far less polluting to supply) water has long been available at a far lower price. Hasn't stopped it becoming popular though.
Have air-conditioning at home or in the car? It wasn't that common in most parts of this country even in the 1980's but I don't recall too many complaining at the time that they didn't have it. With the exception of Tasmania where it's usually installed as a means of saving power for heating and not used in summer, A/C isn't a wise financial decision for most as just putting up with the heat would be cheaper. That didn't stop it being a rapidly growing industry in recent years however.
Buy a house? Financially it's probably not the single best way to make money. But many choose to do it for the same reasons they drive a car, drink beer or own a mobile phone. They are willing to sacrifice some profit in order to obtain some other benefit.
Personally I'm buying a house right now (if these damn real estate agents sort out their arguments - see the thread I posted on that if you want to know details). I'm not buying for financial reasons but rather for personal / lifestyle reasons. If it makes a profit then so be it but to be honest I wouldn't really care if its value doubles or halves - it's a place to live not an investment. I'll be keeping a reasonable portfolio of shares for investment purposes.