Ya know, it seems like a lot of people are simply looking for ways to be honest, yet get a polite point across. We're mustacian BECAUSE we don't like to do the things our non-mustacian friends do. If those things were our bread and butter, we'd have no problem going to all of it, all the time. The core truth is that we don't 'typically' enjoy those things. Doesn't matter if the reason is money related or not, you'd turn it down if there was any other reason, too.
I don't want to spend money at restaurants all the time because that's not how I like to spend my evenings. Restaurants are noisy and hectic most of the time, and watching people drink then get in their cars and drive home bothers the hell out of me.
Vacations, again, group vacations are typically not a place that I want to go, or with people I feel like going with. That's a lot of money to spend on something I'm not going to fully enjoy... PLUS I have to use my hard earned leave time. My time, money and leave hours are precious to me.
Weddings... I hate weddings, because I had a rotten divorce. I wish the people well, but don't make me watch. If its a wedding where they actually value the guests and do more of a party in appreciation of the people who support their decision, instead of forcing people to rent $200+ tuxes and spend money on destination drama, then end up drinking in an area with only a porta-potty, yeah, not gonna be interested, sorry.
Usually money isn't my main reason for not wanting to do these things. Dig down and look, is it yours?