It all depends on what you consider as looking good. I could probably look better if I had more money. But I still make the effort and scrub up all right. But I'll also say there are plenty of people I know who obviously spend a lot of time and money on their appearance and still look bad or cheap. An aging hair cut or colour or ill fitting clothes or bad shoes are all it takes.
First off, if you buy a few good quality items of clothing, they should be up to regular washing. Also, things like jeans unless you get sweaty or mucky aren't actually supposed to be washed after every wear. If you look after clothes when you wash them, they don't wear as much. And unfortunately I've learned the hard way more expensive clothes don't always guarantee quality.
There are cheap ranges of make up. And plenty of you tube videos out there to show you how to look good with few or cheap products. Also choose products wisely. A good quality mascara and foundation can carry cheaper products.
Depending on what type of hair you have, it doesn't always need regular cuts. Mine is curly and probably looks better longer than I wear it currently. You can get a dry trim most hair salons round by us for under a tenner.
I'll be honest and say I've never had treatments and don't see the point. Wash your make up off before bed, get some sleep and moisturise. I've never had my nails done or anything, shape and paint my own nails while I watch telly at night.
Maybe I am the exception, but I've always been someone who likes to put pride in their appearance. Even if I have to get up a bit earlier when I'm tired to put a bit of make up on or will put something nice on even if I'm dressed up for the occasion. It makes me feel better about myself. It's my time for me in the chaos of my life. I say all this as someone who works evenings and then gets up at 6am to do the school run.