Really, and boxing where does that come? It's practised in just about every country, has actual world titles, is in the Olympics, has World, European Pan-American, Asian, Australasian championships as well as a world ranking system for amateurs and professionals. It has a worldwide amateur boxing authority. It's far bigger than MMA is and is the top level of martial arts competition.
I take it you don't think of boxing as martial arts because like a lot of recent MMA fanboys, MMA is ..gasp.. the thing they're crazy over this year.
In other countries such as The Netherlands kickboxing ranks far higher than MMA. That MMA is the 'world's highest level of martial arts competition' is your opinion, that's fine you are entitled to your opinion, what you aren't entitled to is your own facts.