Yes, for some sailings.  Here's an example breakdown of a sailing to see the difference.  For this sailing it's actually more expensive to book the AI rate than to add on the items after booking even without factoring ongoing sales or CC discounts on the beverage and wifi packages!   Celebrity Summit 5 night Caribbean 1/9/2023, 2 passengers, guaranteed veranda stateroom AI total price (including taxes & fees): $2490.44 Cruise only total price (incl. taxes & fees): $11