It's a bit more than half the price for a course that is half as long, so as such the pricing seems fair enough. Also it's not just a random certificate, but a certificate issued by a well known University. I'm sure ITB is a fine university, but it's hardly got serious name recognition, so I don't think that an argument can be made that an MSc from ITB will be worth more than a graduate certificate from UW.
The problem with certificates is, that you really have to look very closely to understand what was covered. For example Stanford has a range of certificates, some taking as little as about one day of work, the others a few semesters. There are so many factors involved such as professional, undergraduate, graduate, for-credit, for continuous education credit, and so on. Therefore I became somewhat skeptical of them as they almost always require more explanation than available on a CV (if we are talking brand value here).
