For Alaska sailings, balconies are the most popular bookings. As @EDDY0827 says above, TAs can hold blocks of rooms because it's a fairly safe bet that they will be able to sell them. Also, *every* cabin is NOT available to be "seen" via the website. Princess will hold back some cabins so that they can be available for upgrade bidding. In that manner, they will make more money on top of an existing booking for an inside or lower category booking. I'd jump on whatever your TA offers if you really want to sail that date/itinerary. Balconies go fast!