Is there even any gold coin connected with that historical period? I am aware only of silver coins.
Regarding owning them - I think it really depends on your motivation. If you are only stacking silver, then I guess you do not really care what object is made of it. Main thing it's silver and even better if under spot, no? I think this is how some posters above see this.
Now, if you're a collector, you probably have certain areas of interest - you can't collect everything. So does this collecting area fall under your interests? If yes, e.g. because you collect coins of Germany, or coins from that period of time in general, then it is only natural that they belong to your collection as historical artifacts. Or maybe they have aesthetic appeal to someone.
Personally, I have no collecting interest in those coins, but I can understand if other collectors do. But of course I speak about numismatic collectors only, not about someone with inclination to the ideology behind those coins as such. And unfortunately, many times the latter can just pretend to be the former, so collecting such material can raise some eyebrows...