Why would anyone buy a decent antenna, and then mount it in the least efficient method? It's a conundrum I don't understand.
Contrary to popular belief, properly installing a NMO mount does not distract from the resale value of any vehicle, leased or otherwise.
The only thing I'll admit to, with respect to drilling a hole for an antenna, is that it hurts the first time you do it. After that, it doesn't even sting!