I wouldn't buy that for an instant. One might get a driver's license for a variety of reasons including identification or just in case it might be necessary to drive for some reason, such as to drive a rental car on vacation. But one is going to get a medical marijuana card only if he has some illness which he believes may be helped with the use of marijuana and for which a physician has prescribed marijuana.
I have heard pretty much anyone can get one nowadays, and I got a FL CWP primarily to irritate the anti-gunners by adding one more person to the list of CWP holders. I also upgrade my fishing licenses beyond what I will actually use, both as a "just in case" measure and to support state fishery programs.
If I could get a medpot card, I would do it just to irritate people who hate pot.