Perhaps that is true for poker and sports betting (although I don't believe tertiary level mathematics is a pre-requisite), but you don't necessarily need to be good at maths to be successful in business.

Dedication, vision, relationships and a whole host of other factors combine in successful business management, which can go a long way towards mitigating risk.

Many things are negative-EV that do not have the stigma of casino gambling, but we don't ridicule participants' math skills. On average, start-up founders lose money. Are they all as ignorant of math as gamblers?

In fact, I would guess that most human activity is negative-EV.