Sky being sky fluctuate the channels matches are shown on to 'make' you get all 4. Sky were recently forced to sell channels at a lower price to Virgin, BT etc and that is why sky sports extra was re-branded to Sky 4 so they could show matches on there as well.
Most matches to be shown this season on 3 & 4 will be European, SPL, Play offs and Internationals. If you don't need to or would be happy watching these matches on a stream then just get 1 & 2 mate.
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