I can't disagree with you that Yamato's prices are getting out of hand, BUT...the SV-51 will not have less accessories than the 1/48 M&M Valk. The SV-51 will have;
- Very big S-51, according to Graham it'll be Yamato's largest Valk to date.
- Booster/missile packs, granted, there won't be any openable hatches or anything, but they're still accessories.
- Gun pod (has there ever been a release that doesn't have a gun pod?)
- Huge display stand that'll be able to hold the SV-51 in all modes.
- The SV-51 has a much more complex transformation than the VF-1, which means a lot more moving parts etc. (It also means it'll probably be a lot more fragile...)