I guess one of the factors touched on here, but not expanded, was the fact that the types of German equipment was so varied. The sheer number of vehicle types fielded was huge, compared to any single country of the allies. Also German equipment looked markedly different, even when built on the same chassis. A Sherman still looked like a Sherman, whether it was a M4A1 or a VC Firefly. Yes there were a lot of differences between variants, but from 20 feet away from the model they would not be as obvious.
Look at how many different looking tank destroyers each country made and add that to your list of Tanks. Don't forget to add self-propelled artillery too. Then what about captured and converted/ composite vehicles? You have a pretty big list of German stuff compared to your Allied lists.
Then look at how old the hobby is. Someone new to the hobby years ago would usually be young and looking at buying a range of vehicles, not the full complement of one vehicle's sub variants (only us freaks do that hey Sherm
).
The mystic built around the Tiger was not something new. Every allied tanker feared them, and saw one whenever they saw any German Tank. Film, books, etc all made this tank larger than life, and of course every kid wanted one. The pull of the tiger was a natural avenue to steer you to other German vehicles as well. (Even Sherm has admitted to building a German vehicle or two in the past
.)
But how many real manufacturers were around then? One of the most important things a manufacturer looks at is longevity of moulds and cost vs revenue. How many early Tamiya German vehicle offerings were based on the same Panzer IV hull and running gear components? Back in 1979 based on the Panzer IV chassis there were:
Panzer IV D
Panzer IV H
Wirblewind
Mobelwagon
Stug IV
Brummbar
Jagdpanzer IV
7 kits from 1and they all looked different! Then Tamiya also had the Panzer 2 and Marder 2, the Panzer 3 and Stug 3, Panther and Jagdpanther and the King Tiger and Jagdtiger.
The same principle applied to the M3 Stuart, M5A1 and M8 vehicles, M3, M16 and M21 halftracks, M10 and M36 and the T34/76 (2 types), Su-85 and SU-122, but apart from the difference between the T34 and the SU's these groups all looked the same from a short distance.
It has only been in recent years that manufacturers have realised that today's modellers are older and more discerning that those of 20-30 years ago. (How many of you 30+ guys can remember your Fathers regularly buying and building kits 20 years ago?) We are not prepared to accept the compromises of the past and expect each kit to be accurate in it's own right - whacking a M4A4 hull on an M3 Grant chassis don't cut it! Also, how many kids can afford the cost of a Dragon Wagon or Famo, both with trailers, these days? We have grown with the hobby, and it has grown with us.
Whilst we applauded the M8 Greyhound and M20, are now eagerly looking toward a decent M36 Jackson and beg for a Sexton, many of us still secretly covet the recent German offerings like the Marder 3's, The Karl's and Leopold's, etc. Old habits are hard to shake.
Then again, I could be wrong............................. maybe it is just a size issue after all. Everyone just wants a bigger, meaner, tougher tank than the next guy