I think you made some assumptions here that just aren't true.
First off, I am not getting into mopeds, I already am! I have already owned and cared for and fixed a moped of my own. I know whats involved. If I wasn't serious about getting a moped I would NOT be posting here and scouring Craigslist like a mad man.
Of course I know that I won't get a PERFECT moped for the $400 to even $500 range, but I want one that runs, and I can ride it to work the next day after getting it and registering it. That means to me the engine works, the lights work, and it has brakes. Anything else thats wrong with it I will fix over the next few weeks after getting it. I am not afraid to fix it, I might not know how to fix everything but I am excited to learn anything I don't already know.
Now if I already had a vehicle like a car or truck I would be happy to buy a broken moped. I would fix it over time and get it running. I would use for the same reasons as before though, light cruising and getting to work.
What I mean by light cruising is that I won't take it for 6 hour or more rides, I'll take around town, for fun and to go fishing and to the market and whatnot. I freakin love riding a moped even if its not to go anywhere in particular.
I have a bike by the way. I drive it to work about 50% of the time, other times I borrow a car or get a ride. But for me, I work at 6 in the morning, sometime 5:30 and it stinks riding a bike to work then. Going home is fine but its not the only reason I am getting a moped, thats for sure.
In my position it is absolutely not silly to only be looking for a running moped. I don't have a vehicle at this time. I sold it before I moved to NYC, now I am back in suburbia, but thats another story for another day, the point is I dont have a vehicle and want to save up money for stuff. That further goes to show why a moped would be perfect for me right. It would allow me to get to work, get to the places around town I need to go, and I would be free to cruise at my leisure.
You made quite a number of assumptions about me, hence my long post. Hope I made it clear again.