Am I crazy for wanting quads, quints or sextuplets?

It's insane. I have twins and there is a heck of a lot more to it than a few months of night time feeding and diapers. Everything I do is doubled- nursing two babies, trying to console two hysterical infants, two carseats to juggle. Now that they are older, I'm constanly chasing two 18 month olds who are bent on destruction or hurting themselves. I don't really see at time that it's going to get easier. Yes, it's rewarding, but it's hard work. Multiple that by 2 or 3 and hoping for it is insanity.