I have a serger and love it. I don't use it every day but then I don't quilt/sew every day. How I use my serger:
Serge the raw edges of yardage that I wash before using. Keeps the edges from raveling all over the place
Used it to make masks - quicker and easier than stitching
serge the edges of a completed quilt before binding. Makes a nice clean edge to put the binding on
serge the edges of fleece and/or flannel
when hemming a too long dress or pants, serge the excess off the hem and have a clean edge to stitch for the hem. (My machine does not do a coverstitch like the hem of a t-shirt)
use when making pillowcases for charity......way faster than machine stitching
For home dec projects - curtains, cushions and cushion covers
making pet beds
Those are the ones that pop into my head right now but I love having that "tool" available
Sergers have come a long way over the years and they are easier to use - thread- than ever before. Do a google search and read up on sergers and see all that can be done with them. And if you are still interested, a used one can generally be found for a really good price.