To answer your question,
I think many people are intimidated by the idea of driving a class A; they seem so large and unfamiliar to people who commute in cars. Class C cabin feels more van-like, so more familar and less intimidating. Really, I do not think an A is harder to drive. If you might want an A, be glad others are hesitant to drive them, as you get a better price.
Second, storage space is less important to a family buying a used rv for weekend trips than it is to fulltimers or to those taking months long trips. Be glad if you are not competing for rigs with all those folks.
Third, while that overcab bed does not work for you, it appeals to families as they shop, as they can imagine their kids sleeping up there. Again, be glad if you are not competing with them.
I suppose if I pulled into a parking lot for a nap and there was trouble outside, I could just drive away without going outside. Then again, I generally go to campgrounds, of parking lots for my sleeps. So, if I had pulled into a real campsite and attached water and power, I'd do some damage to cord and hose at least. I'd have to wIt while levelers came up, so danger might enter before I could drive. Water would be spewing from campsite tap, potentially flooding campground. I might damage campground or my electrical; that could be awful and expensive. Oh, and my car might just be in parked in front of motorhome, blocking me in. Are you sure the drive away from a problem is really important enough to change your buying decision?
On arrival in a campground inrain, it can be nice to not " have" to exit to set up. Just live off batteries and water tank until weather clears. But that does not happen to me much so far.
If you budget is indeed meager, you likely will find greater value in truck and towable RV. Your money, your decision though.