I fail to see the logic in your response to my question.
There is just as much MiniPCI wireless devices out there that are broadcom as there are atheros. I just happen to have a pile of Broadcom cards here I could be using in those empty pci slots, the hardware is there, but I cannot use them because you have choosen to neglect supporting this standard hardware. So I guess I will just go to mikrotik.com and purchase some r52 cards instead of saving my money because I am "cheap".
I know that Mikrotik is a business, and must cater to its overwhelming customer base, which is commercial consumers that know what they want, and dont mind spending a generous amount of money on multiple devices. But that does not mean you should neglect supporting perfectly usable hardware on your wonderful platform. I also know that the majority of mikrotik customer purchase your equipment and do not mind a lack of support for retail class wireless cards because they , by in large, require high powered solutions for long range deployment.
But those 400mw and 600mw cards are not neccesary for all deployments. There is still a viable use for sub 100mw cards.