The standard in the UK and the standard in the US are not quite the same. Which standard one prefers if moot if one wants or plans to show here. I do not see anything moral or immoral about it. You may have a reasonable business perspective, but unless you know their actual numbers, it is difficult to do more than guess. Also, I am guessing that they are selling very few, of the birds they actually imported, but are more interested in breeding them with american stock to increase the gene pool and numbers.