That's because:
1. You, Joe, know what you're doing in digital marketing
2. You've got too much to mess with before jumping into social media
3. You can't flip a switch and say "I'm here" with social media
The big thing is that people don't like car dealers, they don't like to hear about cars all the time, and they certainly don't want to be advertised to. This is why car dealers mostly fail in social media.
You nailed it Alex. Time is not infinite and Opportunities are EVERYWHERE.
If any dealer works FB, the time comes from somewhere, some other internet marketing project has to be "de-ranked".
Is FB more important than PPC?
Is FB more important than SEO (organic)?
Is FB more important than SEO (local)?
Is FB more important than VDP merchandising (aka comments)?
Is FB more important than VDP auditing?
Is FB more important than Spilt Testing?
Is FB more important than Multivirate testing?
Is FB more important than CRM Schedule Optimizing?
Is FB more important than Dealer Reputation Management?
Is FB more important than chat?
Is FB more important than email marketing?
Is FB more important than database marketing?
Is FB more important than micro-site marketing?
Is FB more important than GPOM?
Is FB more important than on-site coupons?
Is FB more important than Video (walk around videos, email videos, cust svc videos, sale of the month videos, referral request videos)?
...there's more, shall I keep going?
Time is finite. What tasks (above) do I ignore to "work FB"?
Game. Set. Match.