@drron just pointed out the key point and that is they are hard to find in a premium cabins.
I just plucked a random week in Nov obviously economy tickets. I really think it boils down a couple of things
1. How do you personally value the points (personally for me it is sunk cost and they don't earn me anything so I don't really value them that highly)
2. How quickly can you earn the points and how many do you have
3. What do you value more - flying in a premium cabin or getting to your destination.
4. The game has changed and most likely will change again for the worse (I'm jealous of hearing stories about finding regular flights in J and F at convenient times)
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