They leaked from the windows.
If owners were proactive on routine maintenance of keeping them sealed properly there would not be leaks.
Which is why you would be hard pressed to find a newer Class C with windows in the cabover. They manufacturers stopped putting the windows in the cabover area.
To the OP, I think from a financial point, what any RV'er buys should be based on "how much" they will be using it.
If you are only going out once or twice a month a few times a year I would suggest a used Class C or a TT if you already have a good tow vehicle to tow it with. Both can be sold around the same price you bought it for if you want to upgrade the next year or so.
If you buy a new Class A they loose so much of their value the minute you drive off the dealership lot. IMHO I just couldn't see investing/loosing that much money for it to sit the majority of each year. Just saying.