There is no advantage to breeding a twin, other than shown or hidden traits. Just like any other kitty. Breeding twins, doesn't mean you will get more twins at any time. Getting a set of twins is just a nice surprise for the breeder.
If you get a boy and girl twins, then it saves you the trouble of trying to make a breeding pair of sibs.
I believe they should be priced for their traits like any other kitty.
Twins - what is fair market value?
