To cruise is about $150pppday. Then if you have a family of 4.
'Likely' is a very nebulous term.
I have a cruise on Symphony OTS Central Park Balcony for 7 days out of Fort Lauderdale in Feb 24 for a total price of $673pp. That is $96pdaypp.
How many hours is the tour? Been cruising Princess since 1987 and have many cruises and days with Princess. Been through many ship tours on the ships many times. Including the Bridge, Backstage, Gallery, Laundry, etc. Been on the Bridge and helipad as we left and arrived Venice.
So, I do agree with you that $150 is high and should be worth maybe worth half that.
JMHO!