i think the fish in question is a beautiful fish(even more so if it had of been the real thing) . hybrids are bound to show up at some stage and yes it would have been better if it wasnt sold as something else. i dont really agree with culling hybrids unless its the last resort - i mean known hybrid fry can be fed to something and i think you have done the right thing here by giving them to living art for a display tank , as there is plenty of people out there like me who dont have a huge interest in breeding (im slowly stocking a male only display tank) that would still have an interest in a colourful hybrid!
on another note im wondering arent a lot of hybrids sterile ? , im thinking like a mule or i have sailfin mollies crossed with black lyretail the male i have is sterile