Yup, this release is expensive, but it is quite expected given the rather similar price of the VF-0, and that SV-51 is a very large bird.. The various VF-0 didn't seem to exactly fly off the shelves; it could be they were also pricey then, or because of the reports of legs falling off, but they eventually did sell out not long after release & command some higher prices.
I'm thinking back on my valk buying habits over the past few years, and naturally I would go for the low hanging fruits first. Only when there was a draught of releases or availability of other valks to fill the holes in my collection, then only did I look toward obtaining the various VF-0. I suspect this would be the case here as well with many collectors?
Not sure how Arcadia would be able to fix the floppy wings from Yamato's iteration, given the overall thin & spindly design, but I have faith in T-Rex. Factory QC though, is another story - hopefully no more legs falling off shenanigans like the VF-0D & 0A.