Why buy MKR?

Could you elaborate on the rationale for purchasing MakerDAO's MKR token? What are the key benefits and advantages that MKR holders enjoy? Is it primarily a speculative investment or does it serve a practical role in the Maker ecosystem? Moreover, what are the potential risks involved in acquiring and holding MKR? How does it align with the overall vision and goals of MakerDAO? Could you provide a concise yet comprehensive explanation on why one should consider investing in MKR?