How team fortress 2 does it

Tf2 has this kind of system where you have to actually pay for your 'pass' into the competitive play mode, which means only serious players who want to invest time and money into actually getting into competitive play mode and improve thier skills would spend thier money for the pass. Would be great of league had a similiar system, it would prevent all the little children and the nonsense trolls/flamers and unskilled players who should be playing in casuals rather than ranked from ruining the competitive scene. As for the payment, im sure that anyone who is serious enough about ranked play would be able to pay for a "League ranked pass". Suggestions?
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