I don't think I can count the number of teen gatherings we "hosted" where we served popcorn (popped in oil but not buttered), homemade brownies (made with cocoa powder, not chocolate), and iced tea. Really our kids were hosting, but I would make the snacks. The other kids were welcome to bring soda if they wanted to, and some did, but often they went back home with what they brought. My kids were usually having friends over to play board games or D&D, which was a lot less expensive than going to the movies or hanging out at the mall.
Indeed, in 3+ decades of being an adult, we have almost exclusively served water, iced tea, and/or lemonade at gatherings. And I mean water in an Igloo jug, not bottled. Now thanks to a thrifted soda making machine we can offer fancy sparkling water as well, if it's just a few people. We also rarely serve alcohol -- most of our family members and friends don't drink it and we don't drink it regularly either.
Our typical dinner served to guests is soup + salad + bread, with everything being homemade (including the dressing for the salad). If it's a big crowd we'll do "haystacks" which is basically Chipotle style burrito bowls with chips. I'll make pinto beans, black beans, and rice, and then we have fajita veggies, lettuce, cheese, guacamole (if avocados are free or cheap), sour cream, salsa, etc. We just serve it as a vegetarian meal since we have a lot of vegetarian friends anyway.
I just don't like things really fussy or expensive, in part because I'm against the idea of "entertaining". I just like to gather with people I love and enjoy their company, and I don't need to impress them.