In order to draw more viewers I imagine there needs to be that amount of fluff.
I think they will draw MORE viewers if there is more mopar stuff.
There are already tons of "reality-soap operas" on TV and the web.
There are already several car-related shows as well.
Frankly, its the mopar aspect that could make graveyard carz different enough to get a viewership.
American Chopper and those other "reality" shows can (now) have more of the soap opera stuff, as you put it, because the characters have already been developed and they already have an audience "hooked". Think back to American Chopper's first season....it was MUCH heavier on the bike-build aspect. As the characters developed they switched to more of a 50/50 mix of bikes/"drama" & tom foolery. And even with as popular as that show is, it is losing viewership.
For Graveyard Carz, while some of the fluff was funny, it wasnt funny enough to influence me to come back and view other episodes....they arent as funny as they seem to think they are, honestly. They seem like nice guys, but what I will (may) go back for is the meager amount of mopar content, only because there is so little of it to be found on TV.