The RCL ships are probably filling up faster than the Celebrity ships. Those of us in the know, will most likely go for the Celebrity ships, and can benefit from the fact that RCL is the "better known" line. I'd take advantage of the situation, and book Celebrity myself! If you really want the RCL cruise, then book it, and watch for a price reduction later. When that happens, call RCL, or your agent and get the refund, or onboard credit. It's a win/win situation!