very easy to overlook
> Quite a few vendors base product support costs on percentages of current market price,
> which they typically determine. What may seem modest at first may be very expensive
> three years from now. Vendors can be bought, sold, or change hands; the management
> team you buy from may not be in place a few years from now. And you may get new
> managers who want to "tweak" the maintenance costs or service model.
One of my previous organizations were badly hit by an ownership change at the vendor end. So I know how important this is, yet this is very easy to overlook. I wish I had come across this advice earlier.