My guess would be Jeremy Piven has had that Bronco for close to 4 or 5 years after he bought it from Rocky Roads. Jeremy Piven has received a ton of press in it and he clearly loves it by the amount of times he's been photographed in it.
My guess is also that he probably has a regular mechanic that works on it and his other cars. It is also my guess that a 35+ year old car whether it be a Bronco, Mustang Falcon etc. may not want to start from time to time for one of a hundred different reasons.
It's easy to jump on the bash RockyRoads bandwagon, but it's also nice to see celebrites enjoying thier Broncos as much as we do.