It makes sence of course.... I the SF Bay
area you can plan on about $11 per foot plus electricity, which will run about $100 in the winter.
The guys in LA can comment, but you should probably plan at least 40% more.
a boat with the slip does help... but it won't normally get you a legal
live aboard slip any quicker. Most Marinas
have long waiting lists for live aboards and don't normally transfer the live aboard certificate to the next owner, but instead transfer it to the next person on the waiting list.
Another option is illegally living aboard
your boat, which commonly referred to a "Sneak Aboard". In some marinas
is done with regularity and overlooked by staff.
Other marinas are serious about it!. The marinas monitor
their electronic key cards and if you are in and out of the gate or bathrooms to often, they will challange you.
If you are caught they will force you off the boat or sometimes kick you out of the marina all together. Then you are stuck looking for another marina.
So with that in mind, just research
your options for finding a place to live on the boat, beofre you buy it.