

While I get the underlying point, any schedule for changing prices is going to cause a proportional gap as well. Even changing annually will have points in time where purchasing power relative to the dollar changes.
Plus constantly changing would seem like they are trying to get more at certain times. Honestly there isn’t a pricing scheme that involves the US dollar that isn’t just converting local currency to dollars at the time of purchase and that is a whole can of worms too.
It isn’t the only place, but it is one of the few where the content is somewhat searchable on top of just having a very large amount of content.
Plus people like to stick with what they know.