[pluma]

Sure, but this can be reduced to "it's worth the risk if you have a financial safety net to fall back to if you fail or burn out". In other words "the high risk discourages people who are not already well-off and the high reward primarily benefits those who are".

Or more simply: if you have a few tens or hundres of thousands of dollars you can fall back to even if everything goes wrong, it's worth the chance to become a millionaire/billionaire. If you don't have that safety net, you'll most likely ruin your life unless you're extraordinarily lucky (i.e. lucky enough to win even without the advantages nearly all the other winners already had).

Meritocracy is biased towards affluent starting positions.