No regrets here, and I have more than 50 machines. About 13 are antique toys, bought in a lot for a reasonable price; they needed work. Restored, they make a fun display. Another four are early chainstitch miniatures, and then there are many handcranks of various makers and vintages, four treadles, a couple in cabinets, and portables. Every machine was bought for a reason -- sometimes a rather flimsy reason -- such as the 319w with the cool typewriter-like keys. Odd or even slightly strange mechanical features sing to me.
Right now I alternate between the 319, a 15-91 in a cabinet with a knee controller (love that!) and a Standard Rotary treadle, where my goal is to do free motion quilting using a recently acquired foot made for that machine. The foot works, but my technique.....not so much.
There isn't much more space available, so things are slowing down.
Dianne in Colorado