Did you talk the other authors? or did you check the topics which are opened in the forum?
I think WordPress Themes industry is very changeable. Today in trends one style, after 6 month in trends other style. New themes every day publish on market. Is normal. Client can buy trendy products with high or middle price. You can improve your themes and set new price.
Any official reply from Envato?
There is no response
@ KlbTheme totally agree with you on this!