Thats assuming that 200k people will sign up for Netflix solely because of the Playbook, and that would be somewhere in the neighborhood of 20-25% of the Playbook userbase to date if RIM has sold 800k-1million devices. For many people, especially the ones complaining right now they are already subscribers, Netflix would lose money just to support a small segment of their users. They would need to sign up new users to make money or at the very least cover their costs to support the platform.
Look at this graph, you can see the trend of how people actually use Netflix and on what devices
Click to view quoted image
Only 3% of iPad users use Netflix...what do you think 3% of the Playbook would be?
The vast majority of Netflix use is done on devices tied to the home, or on devices with massive marketshare in the mobile space, or mobile entertainment devices (3DS/Vita).
When you have stats that look like this, would you think it would be wise to support the Playbook?