Obvious disclosure: I work for Autodesk. I have a vested interest in seeing this product in your toolbox.
Sticker price is right around $2K in the US, $2500 if you put it on the network. Your typical engineer bills out at $125/hour. If you spend 20 hours a YEAR working on swept-path, parking lots, or reoundabouts, the math is pretty simple. To me, just the parking lot layouts ALONE would have made my money back (stupid offset, array, reoffset, erase, offset, array, reerase, reoffset, erase it all, start over process...) Software is cheap compared to time.
Not to mention, there is a promotion right now for Map 3D and Civil 3D customers. New licenses of Vehicle Tracking 2014 are available at 50% off SRP for Autodesk Subscription customers who already hold a license of AutoCAD 2014, AutoCAD Map 3D 2014, AutoCAD Civil 3D 2014, or Infrastructure Design Suite 2014. This offer ends on April 23, 2014. That's from this page: http://www.autodesk.com/products/vehicle-tracking/overview.
You are right about software is cheap compared to time. And I would not discuss the quality of AVT, I have worked with it and the Vehicle Tracking is not worse or better than other software. The Parking Lit Designer is good and if you do such work a lot, it is a real timesaver. If you don't do this much, a few dynamic blocks will help too.
But your calculation is wrong. You assume the engineer has a 100% profit if you translate $ 2500 into 20 hours.
If he has only $ 5 profit ph, then he need to work 500 hours with the software before he can start making profit again. If he also needs a day of training, then he needs to work almost 700 hourse before he can start making profit. It might be less if the software is such a timesaver that he can send bills for the time it usually cost but he actually worked less with the new software. But in the real world you must be cheaper than a competitor, and you can't keep sending bills for the time it cost in the past, so then there is no extra profit.
And that is why I think the software is quite expensive.