I also live on a boat, in France, and the pressure on mooring places is unbearable in many places, including all of those conveniently close to "good" jobs. This is worsened by the waterways administration's Kafka-like madness. For instance, a boat which has mooring rights in Paris will cost about €600K more than the same one in an unremarkable place (mooring rights are effectively attached to a boat, and non-transferable).

So more extensive evidence shows that when living in a boat becomes popular, prices (in money and inconveniences) do skyrocket.