I'm currently at six.
My first decent bass was a Ricky 4003 which I've still got, a seventies bitsa Pbass, a Squier Bass vi, a Waterstone twelve string a short scale Danelectro in a funny tuning and I've just aquired a really quite amazing Electrical Guitar Company TB2000 that's all aluminium!
I don't even miss my old 62 Precision now I've got that.