No. Several well regarded manufacturers also make products in China. Phil Jones Bass, Ampeg, and Trace Elliot come to mind.
Agreed, I don't think it's that at all. I think it lines up more with the same reason why Orange or Laney is not as big in the US and Mesa and even Fender aren't as big overseas as they are in the US. Strictly amp speaking. Some of it is marketing, some of it is cost vs comparable competitors, some of it is availability, and a lot in my opinion is just that the average kid/person going to shows and in music stores doesn't have a chance to try one.
Heck, in this thread a lone, how many people give one a try in a store and snag it up immediately? That goes to say their used value is excellent and the product itself is too. I think that it's a tad higher new, or towards the high end vs comparable products new. A lot of that is probably tied to how they likely have their product go to their shop in England to do final QC before sending out to distributors, thus just like Marshall, et al from UK, they are much more expensive overseas than at home.
Whew didn't want to get long winded, but I shoulda known I would.
I imagine some of the lower popularity could also be from some "issues" way back. One was a grounding issue that happened with ABM's I think a long time ago shortly after they moved production to China, no longer an issue. Also some "odd" models that were not popular and semi commercial failures, at least stateside. Then also a frequent comment on forums I saw way back was that they (MAG and ABM) were that they had baked in voicing and could only do vintage sounds. I never understood, as I always thought the ABM preamp were one of the most versatile I've ever experienced. Oh and that their early ventures into class D were fraught with similar issues as some of the Ampeg PF series were.
Oh and for cabs, probably that a lot of people's experience with em, were that they were big old school sounding cabs the size of Eden and SWR. Good sounding, but too big and heavy. Not anything like the newer RM economically sized designs, though.
Enough rambling, just wanted to give my thoughts on Ashdown stateside since I became aware of em almost 20 years ago.