We are in the 200k plus club and while we aren't mustachian by many peoples levels we are pretty mustachian for our income level at a 55k a year spend level (33k of that is our 15 year mortgage, taxes and insurance in a HCOL area). We don't scrimp on everything, we have newer cars (paid for in cash and we both have a commute that requires them, we bought the house then my company decided to move it's HQ 45 minutes away with little notice, we could have lived closer to hubz job, but the housing cost would be double or more, he only has a 15-20 minute drive), we enjoy going out and having a good time, and we really enjoy our vacations (which is a decent chunk of the remaining 22k a year).
We've found that the things that make us happy are vastly different from our friends though. They enjoy going out to fancy dinners in DC, dropping 50-100 bucks a pop per night (and we have a couple friends that CANNOT afford to do this, but still do). It about damn near kills the hubs and I when we even go out to eat because we both know I can make the exact food for 5-10% of that, and have leftovers. We also REALLY don't like crowds, so the things we tend to do are free, hiking, walking, gardening etc.
We live in a townhouse so "Stuff" doesn't bring us happiness, it only brings us clutter. This is a new feeling for the hubz, he grew up in a family that tried to buy time together and happiness with things, in a recent conversation (argument) he said I never let him buy things he wants. I asked him what it is he wanted that I have said no to in the last 2 years. After actually thinking about it and laughing he said "Nothing, because there really isn't anything that I've wanted that was worth what they were charging for it, that was an argument that I used to use with my dad, now it just sounds ridiculous"
Over the years our mentality simply changed, we don't do everything in our power to reduce expenses, like reuse ziploc bags or bike 20 miles to work etc but we actually get a lot of enjoyment out of getting the best deals on things we will use, like buying a 3 month supply of said ziploc bags for 50c a box instead of 3 bucks. Overall, we don't sweat the small stuff, we get a lot of joy watching the other 75ish percent of our money make us money and just plug along until we hit the magic retirement number in a few years. It's a to each his own type of thing for us.