I truly don't know the set up but I don't think that 150 people managed 15,000 sites.
150 people managed some problems for those sites and directed the traffic for others.
Code (javascript errors for example), 3rd party implementations, menu changes, etc will be sent to some programming level, marketing questions for certain dealers to the marketing department, banner graphics to that department, etc.
In the end if you add all those, plus management, development, etc you have something more like 3.2 people (not scientific based number!) per 100 dealers.
We all tend to forget that when the weather is bad and our plane gets cancelled the airline company support number is busy, that the bank has a line on the 5th of the month, and that the supermarket cashier takes longer on Saturday morning, but all companies struggle with the correct balance of available budget and available support that is always overtaken during peak times.
My office is quiet and dealers think we are awesome when car sales are abundant, put 2 slow weekends together in a row and phones ring of the hook and we suck (just like DDC!).
