For me, it's all down to HDzeta being a premium label whose releases are of high quality, few and far between in number and much sought after, thereby commanding the high prices they fetch in both the primary and secondary markets.
Those releases have also tended to concentrate on classics of the cinema including "Lawrence of Arabia", "Gladiator" and the forthcoming "Saving Private Ryan". (I'm aware of "How to Train Your Dragon" and don't need reminding of its inclusion).
"Terminator 3: Rise of the Machines" is generally considered the weakest of the four "Terminator" movies, although I'm inclined to agree with
@leelee17 , having seen the trailer for "Terminator: Genisys", that the new film looks likely to supersede this as the worst of the series.
I just don't think that this particular film is worthy of the special HDzeta treatment. It's rather akin to including a trashy novelette in a collection great literary works or a cheap bottle of plonk in a collection of fine wines.
Don't get me wrong, I'm a great fan of the "Terminator" franchise and I even own the German Steelbook, for the sake of completeness. To satisfy the completist in me, I may even get this release, depending on the artwork. I just feel that there are plenty of titles out there which are far more deserving of an HDzeta makeover.