I have an older Kenmore (1972) - a real workhorse. 5 years ago, after not sewing for awhile I purchased a Viking 870 because of the big throat, special features, and because I "deserved" a nicer machine. Last year I bought a brother pq1600s because FMQ was frustrating on the Viking, and I could not find appropriate FM foot for my Kenmore which does FMQ well. Also the Kenmore has a small throat. I use the Brother most for quilting and piecing, the Viking for fancy stitches or anything that needs to be zig-zagged and the Kenmore sits in the closet which makes me sad because I do love it.
I also have an Evolution serger because I wanted to serge and decided I "deserved" it. (I'm going to "deserve" the poor house if I keep this up.) Wonderful serger and I use it primarily for alterations. Not sure that justifies the expense, but then . . .