I generally enjoy figuring out fabric choices from my stash, with maybe a sprinkle of 'new' depending on finances and feeling. But I can definitely see the attractions of kits.
Closest I have come so far was buying a bundle of fat quarters made up as a 'starter set' (I forget the proper term) to go along with a pattern - the bundle was not intended to supply all of the fabric for the quilt, just give a jumping off point/some fresh to use in addition to existing stash. I enjoyed that.
So I'd be open to buying a kit for something I really liked.