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He's 40 now, so still top of his game, but he has more of his best years behind him than in front. He needs to work out how he can continue to generate sponsor interest and stories for his corporate motivation talks so he can prolong his career. TCR has to be a better source of stories than RAAM.
He has had challengers in RAAM and he hasn't won every time he has entered, so not totally dominant. But must be more interesting for sponsors to have something other than 5th RAAM win 6th win, xth win, etc.
Clearly it's always been crazy expensive, I think what he meant was he's not certain it will be viable in the future as it's hard to raise the sponsorship and entry numbers are going down as a result. He said in his book that he didn't enter some years as the cost was too high. If he can get RAAM-level sponsorship with TCR-level costs, it makes a lot of sense to shift focus.