macross is a current series that does not require previous knowledge of the existing series. by the looks of the animation etc.. it seems aimed at a slightly younger crowd as well. 1/100 cheaper models seemed aimed at the general public and im sure are thought to be more profitable than the original macross market.
the original macross market has alot less population, but the people in it are willing to spend alot more money (partially because they are now alot older than its intended target audience)
macross zero is currently seen by more people than macross is seen by today (im not talking the past). these people dont neccessarily have any connection to the original series. they are less informed, less die hard, and most likely younger, meaning they have less money.
imagine the target audience for macross zero is something similar to universal century gundam fans. fix toys are considered high end, when they themselves are generally about 1/4 the cost of a FP 1/48. since yamato is competing with non die hard macross fans .. if the toys are too expensive they will just go buy gundam, chogokin, eva .... or any of the other toys from series they probably also watch.
whereas a diehard macross fan, will buy macross toys at any price. so original series macross toys are changed accordingly.
you guys just happen to fall into a category that is included in both groups, the majority of whom yamato probably wants to sell macross zero toys to is not. the number of die hard fans is probably far outnumbered by macross zero viewers, hence the weight thats given to each.
my guess is they is no 1/60 1/72 or 1/48 macross zero toys currently planned. enough stink will get raised, yamato will release limited larger scale toys, and they will sell poorly compared to the 1/100 line.
just imho.