[ajsnigrutin]

It's hard (=expensive) to change all the internal infrastructure or sometimes even internal processes, and if companies manage to stay just a bit cheaper than their custumers cost to rewrite "everything", they'll get the money. Even if some customers do so, with the price hike, they still earn more from the ones who don't.

[_DeadFred_]

There is also risk introduced by change. Risk is very scary when you are in management.