I definitely agree. With african cichlids (where most of my past experience lies), it was commonly acceptable in the past to breed any two species together even if they came from different locations. Now, people are after only 'true' blooded fish, and breeding the same species together from different locations is highly frowned upon (to put it lightly); this would be similar to breeding a Peruvian motoro to a Colombian motoro, or even motoro's from two different rivers in Peru.
I think as more and more borders are closed to exporting rays, the demand for pure-bred fish will increase. I agree the patterns on the hybrids are cool, but (at least from what I've seen), there seems to be far more hybrid rays coming out Asia, where most of the large breeding operations seem to be focused, than pure-bred rays.
The 'value' that I see with hybrid rays isn't exactly in the rays themselves, but if, as I asked in another thread, having two rays hybridize will help the rays spawn with their own species once they've practiced and got it right. So would I intentionally create a hybrid ray? Yes, if it was with the intent of assisting one of the fish with getting it right so that it may reproduce with its own species in the future. But would I intentially breed two hybrid rays together? No, I'd simply take them for what they are, and enjoy them as great looking animals.
I personally can't wait until I get some captive-bred pure leo's, and think that microchipping or some other way of keeping track of the rays would be ideal to help maintain as much genetic diversity among the pure-bred rays as possible.
some came from Frank? maybe he will chip his rays too soon 
