Without a time frame reference the concept of profitability is meaningless. It's probably true to say that almost 100% of customers are profitable for a while.

A hundred up over the course of a year......yeh!!! He's profitable.
Two bucks ahead after one bet.......yeh!!! He's profitable too.
Five hundred quid up after six years....yeh!!!! etc. etc.

Profitability means regular withdrawals and no deposits.....25%? LOL.

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"Not winning on a horse that came first is one thing.....Losing on a horse that didn't come first is something else entirely!!!"