The place I worked included all extra services in the ramp fees or fuel price so we never had to split hairs over what we would or wouldn't do for someone, we were expected to get them whatever they needed and as a result the job was fun and the customers were happy. Once a citation x called in and among their other requests for the quick turn they wondered if we might go downtown and pick them up some ravioli from Original Joe's for the crew. I had 3 orders waiting for them when they rolled in. We got a 100$ tip.
By far my favorite part was things like that. Specifically making crews happy. Passengers are generally pretty easy to please, have their car waiting, be polite, etc. But if you can make a crew's day awesome that's really something.
I like to say that line was the most fun and rewarding job I ever had in aviation, its too bad it doesn't pay a lot. I loved getting home and taking a hot shower after running my ass off all day in the rain or the great feeling when you're busy and moving airplanes around like crazy to make sure your limited ramp space works for everyone. Even the slow days, or the days we washed the fuel trucks were pretty cool in their own way.
I could do without lav service I guess