I have 4:
a Bernina I use all the time;
a 50s/60s vintage Kenmore in a table I bought for $25 about 20 years ago and would not part with, even if I don't use it so much any more;
a cheap little portable I used one summer on a trip, but which needs repair/oiling/cleaning before I can use it again;
and a very old treadle machine which will need MAJOR refinishing to even just display, but which was abandoned in the garage of my parents' house before they bought it 50 years ago. I decided to keep it when my mom sold her house - several years before I even gave much thought to starting quilting.