#2 It can benefit others
Even though Shane McMahon winning the WWE Championship would obviously directly benefit him, there is no reason that Shane holding WWE's top gold can't help other talents within the company.
Because of the amount of attention that is being placed on him and his storyline, with Shane appearing on both Raw and SmackDown each week, those who are in those segments are gaining fantastic exposure.
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Gone are the days of Elias simply just playing the guitar and getting interrupted now he is given an actual purpose on each show, whereas Drew McIntyre is also consistently proving his talent as a menacing heel. Both men would then be solidified if they could help Shane secure WWE's richest prize.
On top of that, whoever Shane then feuds against will be brought into WWE's biggest storyline that will have the attention of the entire WWE Universe. The fans will be behind any challenger against Shane, urging them to get the title away from him, which should elevate them at the same time.