bandai VF1S 1/48 with insane price compare with yamato 1/48

You mean the 1:72 VF1? My experience with VF-25, VF-31 and SV-262Hs, is that they are not for playing or often transforming them. Some plastic parts, really small parts will get snapped. In fact on VF-31, there's a connection part in the waist area that is only semi circle shape with weak support. Over time, the plastics will get loose, and the everything will just limbs around. Also, since its plastic, when you want to move things around after a long time, the friction is enough to snap things around.

I'm thinking of getting something like Hasegawa plastic model instead. It doesn't transform, but the jet mode will make  a great display on a table.

Remember, they are plastic model kit. They're not meant to be played like the DX versions. But I'm poor. I'll have to make do with just the 1:72 kits. Even then, they're getting more expensive over the years.