It's not really clear what you are asking. The prices are what they are, and your personal valuation of the premium cabin is what it is (and we don't know it). Whether its worth it is, I'm afraid, up to you. Beyond the fairly obvious observation that lie-flat BF seats are a lot more comfy than domestic F, and therefore probably a better use of miles, there's not a lot I/we can contribute here... which is probably why 180 members viewed your post but didn't reply.

Try asking more precise, specific, limited questions?