Frank Moorhouse wrote in a not-so-recent Australian: "We need adequate, long-term funding of individual writers by arts organisations, publishers and private patronage." It's the "publishers" bit that stirred me to mount one of my favorite hobby horses: writers can only expect long-term funding from a publisher if the writer is prepared to back a publisher in the longer term.
In today's world of agents and big advances, both of which are supposedly both in the writer's best interest, there's little incentive from publishers to back authors in the longer term. And creatively it's usually best for writer's to find a good publishing house and build a relationship and let a relationship be built.
Sometimes writers benefit from a change of publisher but it should be done as part of longer term view not a short term one, and advances are short term - the theory is the writer is only getting earlier what they should be getting as royalties anyway. Advances are but smoke and mirrors.