Those three things are exactly what you get for the subscription price, even according to FMI.
Each of these has a different value to each developer, so your estimation of its value to you is probably the correct one.
For developers who otherwise would need to buy a separate copy of FMServer for testing, $99 is a steal. For many of us who have been at this for years and count on FileMaker for our business income, even as little as 30 days preview time for upcoming software is a llifesafer (sometimes it has been longer than 30 days).
FMI has generously made TechNet available to subscribers and non-subscribers alike, which is an amazing value in itself if you decide to save the money this year. Sweet deal either way.