Can Princess increase my fair once I have paid my deposit and insurance?
By the contract, yes, they can increase the fare for the cruise even after you paid in full. Does it happen? Virtually never, but it has. It is not something I'd worry about.
I ran amok earlier today about copying and pasting information, and edited two posts (including one of yours). However, copying of short excerpts is allowed and since the Princess Passage Contract
is long and tedious, here is the pertinent excerpt from their contract:
"Carrier may collect any fare increase or fuel supplement in effect at the time of sailing, even if the fare has already been paid in full."
What is important to note is this is boilerplate legal language that is probably in all cruise line contracts.