MK IS a clutch. You can't tell me that MK isn't a clutch when we have a whole hoard of people falling back on him whenever they lose game 1/go against an MK main/get cp'd into Brinstar or Rainbow Cruise/get far enough into brackets. Top players and low level players alike, there's people using MK to hit on their personal worst MUs, even when there's other characters who do it better or if their MU really isn't bad at all and they're just lazy. People can't stand losing in tourneys or missing the prize money, so they take the fastest way of getting better, choosing MK when they need to. Not practicing with their mains or another secondary, just choosing MK. The base skill they have carries over to MK, and if they know enough about him, then. They're well on their way to victory already.
MK is tough to beat using any character but MK, he's got a great MU spread that's to die for. Why should I practice Marth or Diddy or Snake if MK does it better? Most people who play against MK using their mains and lose think about using MK against their opponent's MK. Easiest way to take care of things, you instantly have an even MU. I personally think the root of the problem is all the data gathered (anti-ban forces pro-ban to dig data up from everywhere, pro-ban comes back with loadw of data that shows MK is the best character in the game, people see how MK wins a lot of the money and choose to use him to try and make money), but whatever it is, MK IS a clutch for people to use when their tourney placings seem threatened by anything.
Also, planking's gay to play against.