I have a Small Home Based Sewing Business & my Serger comes in handy for finishing raw edges or anything I want to sew to make it look better. If you want to sell your quilted or sewn clothes they will be worth more to customers if they see the Serged seams. Also, besides looking better overall the sewn item(s) will last much longer if they are sewed on the sewing machine, then Serged.
Last week, I wanted to make a beach bag for my DGDs Graduation quickly, so I Serged the 1 & 1/2 inch strips together in rows instead of sewing them on the sewing machine & pressed them in one direction. I then FMQ'd the fabric to Insul-Brite (makes items insulated, i.e. Suntan oil or food) & the lining, Serged the inside seams (then went back over them on the sewing machine) & I had finished, except for turning it inside out, & adding the handles.