I honestly don't know why I like laundry day as much as I do but I actually really love it. By which I mean, I love the added chore (that I hate IRL!) for my sims to do in addition to holding down jobs, paying bills, raising kids then BAM - laundry is full and the machines are broken agaiiiiin. It's just such an accurate depiction of the monotony of adult life; laundry out the wazoo and 101 other things to be done. If you're a roleplayer/storyteller type like me, laundry is probably the best SP investment.