Reply to Hip hop producers don't get enough credit

Here is something that has been bugging me for the last little while. I've always found it strange that hip hop producers sell their beats, rather than working with MCs and making a song together. Its created this weird situation where hip hop producers are almost never named in the list of artists for a song. The beat is a huge part of the final product (especially in a lot of newer hip hop where a rapper only needs a vocabulary that consists of ten words), and i've always founded it a little strange that producers aren't credited properly. They aren't shown in the video, they don't have the same image, they aren't out there playing big shows and so on.

Examples

Cool and Dre produced a tonne of the "dj khaled" songs. Millions have listened to their music but very few know their names.

Diplo has produced a fair amount of beats that made it into the top 40 (such as "look at me now" and "paper planes". You never see his name under the list of artists however.

Macklemore has 10x as many facebook "likes" as ryan lewis. Ryan lewis is barely given any love in the thrift shop video. Ryan Lewis was actually credited as an artist on the song which was cool though.

I could go on for days with examples but there are some fairly big ones.

Thoughts?