I've bought, sold and traded [i]countless[/i] basses over the years, Overwaters, Musicmans, Laklands, Sadowskys, etc etc etc...........and I came to the conclusion that I wasn't necessarily addicted to basses, but rather I was addicted to the [i]process[/i] of finding and acquiring new basses. The buzz of having some money to buy a new bass is more exciting than actually owning the bass itself. GAS (Gear Acquisition Syndrome) is evil, and I've been hooked on it for years.
For now at least, I've quelled it by going back to where I started with just two basses, a Precision and a Jazz. They're basic workhorses, they do everything I want them to, they sound great, play great, look great, and anything else is just an imitation isn't it? At the end of the day.
My advice, is [i]buy a bass you like[/i], and [i]keep it forever[/i], because selling it and buying another one is [i]utterly[/i] pointless. Believe me, I know.