I collect garage kits (figures) in 1/8 - 1/3 scale and most start around $90 but most average at $120 or higher and some only have a few parts.
Same goes with replica movie props from $10 for something tiny to several thousand, If you get into studio scale models then you start at about $300 and go up.
I also used to make replica movie props as a hobby and even got to work on a few actual props for one of the Star Trek shows.
Remember these are usually limited runs and the cost of silicon molds and resins are expensive and everything has to be cast by hand not stamped out by a machine so it takes time to fill the mold, place it in a pressured container till it cures then demolding and some clean up.
Now this tank model was probably designed on computer then grown or CNC'ed then clean up was done by hand then molded in silicon so there is still hands on labor there, some parts may have even been scratch built.
Resin will yield a lot more detail all around since the molds are flexible, you see this in all the aftermarket parts available these days and yes in some cases there is a fair amount of clean up along the seams if the molds don't sit right..
The down side of resin is loss of detail due to air bubbles in the casting or the molds wearing out and possible warpage (usually fixable with a dip in some hot water).