Quote Originally Posted by singularis
My main question would be, is it worth having a tiny vertex buffer with only 4 coordinates?
No, Vertex Buffer uses Hardware memory in the Graphics card, and old ones doesn't support it. Also, 4 coordinates? you don't need it, the main advantage about Vertex Buffers is speed, the hard work is sent to the Graphics card when using a big meshes with many many vertexes.
I don't know about DX but OpenGL has other ways to gain speed, like creating Linked Lists. Note that Linked Lists and Vertex buffers should never be used together.