There have always been 2 schools regarding the 410. One simply feels it is a toy. The other feels it is a useful tool in the proper hands. Gun makers have basically followed those 2 sentiments, making cheap inexpensive guns or making very elaborate ones. The supply of top of the line early 410's is very limited and the prices are stratospheric.
American gun makers did not start making sxs 410's until the mid 1920's. Parker is supposed to be the earliest. They made less than 570 410's while making over 84,000 12ga. Only 1 was an AH grade 410.
It only follows that the low end guns are growing in appeal and price.