Any regrets going from Gas to Diesel?

I guess I'm also in the minority glass. We have owned all types of rv's covering the spectrum (cab over, class C, class A, bumper pull, fifth wheel, and finally a bus.) Currently have a class A again. Having been a journeyman diesel mechanic for 30+ years, I know the difference in costs for even the most basic items. (filters, oil amounts etc.). Now, factor in the cost of major items (engines, trans, rear ends) and I couldn't convince myself it was worth the extra cost. I hear people say all the time, "but,a diesel will go a million miles". True, but,how many people will put a million miles on an rv? These are not long haul truckers. Here's a simple test, hit a dealer and ask them how much for a set of plugs and a fuel pump and air filter for say a ford V10, then, hit Cummins and ask the same for injectors and an injector pump and air filter. These are common maintenance items. See what I mean?
Just my opinion... yours may be different.