Like a mcdonalds cheeseburger - NATS may not be the best solution out there but it does the job and has great marketing and the right people behind it.
So long as people are enjoying their 2 cent cheeseburgers and don't realise what else is out there they will always be happy
A sponsor will never come out and say ...'oh...nats sucks there are better scripts around' - so the whole effect snowballs into one giant success - for NATS owners ;)