When I was breeding before, the kitten prices were the same whether they were active or non-active. These days, there seems to be a difference of about £100. Of course you would make that back on the very first kitten you sold so it doesn't really make sense to deliberately set out to breed unregistered cats. There are valid reasons why one might produce an unregistered litter or even several, but I can see no reason why one would set out to do so if one was starting from scratch.

However there are some breeds (Burmese are a prime example) where ti is extremely difficult to get an active registered kitten and in such cases it is understandable, if shortsighted, that someone might decide to try the back door route.

Liz