Because in the last 48 hours I have beta-read somewhere over 40K words (two Yuletide stories and three chapters in Chad's new book) and I find it just so satisfying.
Fortunately for our household income, I can get my editing fix through stuff like what I've just done and won't be tempted to chuck law for the publishing industry. (And someday I may be good enough and fortunate enough to have my job duties include editing, too.)
Meanwhile, best wishes to everyone still working on their Yuletide stories!