How much does tag normally cost. Way back in the 90s I was helping a customer that used Wonderware. He made about 25 machines a year and each one used Wonderware. It seemed expensive, much more than our motion controller. I can see using Something like Wonderware if there aren't many systems per year and programming resources are few. However, for 25 machines a year, it seemed like writing the interface in VB or C# would be better.
We also sell to the FAA. They only have a few systems but at the time they wrote all their HMI and analysis in VB6. This doesn't seem to make sense but I was told how much test and logging system cost to the FAA and believe me, they were saving tax payers dollars. The specialized custom data acquisition systems were very expensive.
BTW, I remember years back the a forum member was involved in the drives for the big FAA test machine.