As a 3rd party site owner, (EasyAutoSales.com) I can say that we assume data from the management systems are right until a dealer calls in with problems. Many times, it can be attributed to some piece of data not updating when it reaches us.
I know in one particular case a dealer had switched their inventory management company but their old feed provider was still sending us the last snapshot of the vehicles from the dealer and that caused some problems.
On the other hand, I have also seen dealers not filling out their website and email fields in their management systems accurately and leads for the cars from those dealerships are probably lost on the web somewhere.
BTW, EasyAutoSales.com is accepting feeds from all dealerships for free for any of you that are interested. I know a number of dealers here are already on the system through Dealer Specialties, Diamondlot and a couple of others. If you're with eBiz, just request them to add you to our website - everything is already setup.
- Wei