I don't do rounds mainly because I only drink soft drinks and I'll be blowed if I'm paying for people to drink pints of expensive lager or vodka &coke all night.
If I go for a meal with others I will order according to where I am with my budget that week, so I'm only paying for my own meal, rounded up, with a bit of a tip. I'm not going for this "just split it 12 ways please waiter" shenanigans.
I sound like a right skinflint don't I?
I've got a mate who can't drive and I would generally offer to pick her up (going past the pub we'd be going to to do so) but she started taking the mick eg on occasion I might go for a meal first with OH, and she'd ring and ask if I could nip out of the pub to pick her up. Or she'd ask for a lift home, but then keep ordering drinks when she knew I wanted to leave. She'd also ask to borrow £20, but then "pay me back" by buying me drinks I didn't really want so I didn't really get to see the physical cash again. (This is the mate whos behaviour has got me so agsinst buying rounds!)
Day to day wise like this I am stingey with money (and petrol!). However I will treat my friends. I might send them pamper parcels from Etsy if they're having a hard time. Even posted a friend a particular tool when she struggling with DIY once. Or treat them to a meal. Or a ticket to a concert or festival if we both want to go but they can't afford it. I mainly pay for boyfriend's share of our holidays as he just can't afford it (I'll also go away by myself too, he's not freeloading onto every little jaunt away I fancy!).
i think it's the expectation of others I don't like. If they're not expecting it I'll happily pay. Little stuff like if someone is going on a bacon butty run at work and someone hasn't got cash I'm pay for theirs. Every now an again on my day off I'll take my boyfriend a mcdonalds breakfast and one time all his colleagues shouted "Wheres ours?" so the next time I bought 4 breakfasts instead.
I've also lent someone £18k once which was my entire life savings, but I knew they were 100% reliable (well maybe only 99%, I did shit my pants on a small scale incase they let me down!)
As a Christian I also tithe monthly to my church. Which is totally my choice, it's not something they particularly push.
My philosophy on money is once I've got enough to be getting by, and a bit in savings, then it's nice to help give people a warm fuzzy feeling with some of what I have left. So many people can't get by and I'm blessed to be in a position where I can pay all my bills and have some left over for fun things.