In 2006, I bought a Bernina 440 as my main machine but kept the Kenmore I'd had since HS graduation. The 440 has embroidery so I can leave it set up for embroidery and sew on another. But then I saw a Featherweight and really wanted one as I love vintage things, not to mention it sews wonderful and is so dang cute!
Fast forward 7 years my count stands at 14 machines, including a Bernina serger, 2 Featherweights, and a Singer treadle. Other than the 440 and the serger, everything else is vintage. I found that I enjoy restoring the vintage machines and have re-homed some but will keep several permanently. I can have a sewing party and supply all the machines!