200 x $25, blimey - I'll script the binding for half that price Tracey, looks like the drinks are on me guys. 
We batch the process through DWGTrueView->DWGConvert, which will do a directory of several thousand files in just a few minutes. The charge is an "aggravation" fee.
Edit: That cost initially seemed excessive as we would normally charge clients at our usual hourly rate, in hindsight however charging for additional services such as this might actually make clients think twice before making similar requests. The customer is always right, as long as they're prepared to pay for the privilege.
Bingo, more often than not someone says, "Bind all the XREF's" without "thinking" about the process and what XREF's are for. The fee makes them ask the question, we educate them (free), then they can make the choice with better info. Usually, the response is "Never mind, we're okay as is."
