I rode my kitted (and not kitted) Tomos to work for about 2 months which was just under 30mi/day. The fact that it took twice as long as driving my car (22-24 ish min by car vs 40-50 ish min by moped) caused me to stop. plus, if I broke down, I was realllllly far from walking anywhere, so there was always that added stress of "will I make it to work today?" on the ride in. It made riding mopeds not fun.
This was at the end of last summer. This spring I bough a motorcycle to get me to work now. Same time as in a car, but the MPG and Fun-Factor of a moped.
When I was in school though, I rode all of my peds, stock/kitted/whatever on the 9 mile/day commute to and from school. Every day, all year, unless it was raining. (edited)