It is interesting to see these big strong young men pulling their little suitcases on wheels. I only pull our if it is a big suitcase. The small ones I just carry. My wife always asks me why I don't pull it as it is easier.
I think I can walk faster by carrying it.
I don't have to worry about it tipping over on its side and
I don't want to look like a dork. (Someone who can't carry 10 pounds for 30 feet.)
At least I don't have to worry about #3.