Lets rephrase it:"What will you be giving up by getting a cat?"

1. No more sitting on the centerboard trunk.
2. No more crunches to keep the boat flat.
3. No more tippy boat. You can moor it on the water at lunch break and it won't capsize.
4. Did I mention no more tippy boat? 50% of your brain power isn't tied up with being moveable ballast. Never worry about the death roll again. Heave to your catamaran and enjoy the trampoline.
5. Mono-slugs have limited options for vmg downwind. Most don't have the option of going for the high heat.

6. Leaving the kids on the beach because the laser won't carry them.