It's possible that they don't make any money off them, since there is only a handful of suspended coasters left. Which in turn would raise the cost of parts.

Vekoma has designed new suspended trains.  They look like a cool idea but I've read that they've ruined the ride and it's really slow now.



I still think that the problem is costs.  Replacing trains can't be cheap and a ride like BBW probably needs track work as well.  If there was still a market for suspended coasters Vekoma would be the one selling them and nobody has bought one in a long time.  http://www.vekoma.com/index.php?option=com_content&task=view&id=13&Itemid=11

I think that Lance hit the nail on the head in his recent editorial.  A lot of old steel is probably going to go away in the next 10 to 20 years.