If the older grasshoppers around here are anything to go by that is not a given...
(I like that there are plenty of canal-splaining comments headed in my direction but no actual, erm, real contrary information...)
I do and so I have one. Some people (land or canal based) either can't afford that or are happier commuting for the cost saving/quality of life. There are plenty of CC-ing plans which don't take you much further than 10miles (in either direction, making 20 miles in all) from where you need to be at certain times. Think the CRT provide examples for people who need to be near schools in term time.
Edited to add: I've ALSO used pre-bookable mooring in a busy location I was passing through which guarantees the same thing for visitors (such as canal spotters)... but those wandering around the network sometimes object to having to pay for moorings in particular locations. The argument ("if you wanna be guaranteed a mooring in a popular spot for n nights then pay for it" is kind of the same regardless of the size of n though...)