I have six; see my signature line.
For all the odd jobs, repairs etc that can be done with straight stitch only my preferred machine is Caroline, the older 201 which sits on the desk work-table downstairs and sometimes I use if for FMQ as this table is bigger than the one upstairs.
Other sewing is done in the sewing room upstairs. I use the other 201, Azilia, for straight stitch and Vera the Husqvarna for the utility stitches, and I wouldn't be without the overlocker. The cover stitcher gets used for topstitching knit fabrics but I could live without it.
My extravagance is the little Featherweight; cute but also portable.
I don't feel the need for an embroidery machine, or even one with a zillion fancy stitches, they wouldn't get used, although occasionally I think it would be nice to have an alphabet facility for labels.