Giglamesh, I think in the early days, people wanted red juveniles because they weren't as common as yellow ones, and they believed it would bring out a better shade as an adult, but it turned out that many of the reds were imported, or something like that. Not too sure.
Native GTP's only have yellow babies. reds are from PNG etc but they also have yellow babies. So red baby = exotic.. yellow baby = possible native possible exotic..