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you may be a winner with demo money but end up losing money when playing for real
putting it simple: it's usually better to go with real money from start, even if it's a little amount.
It is not necessarily so, but it's possible, so overall I agree with you about betting with little amounts from the start instead of betting with fake money.
It's just that there's a myth among gamblers, it concerns slots mostly, that you are winning playing in demo mode, but once you switch to real money, you start losing. And I want to emphasize that that's just a myth without any evidence whatsoever.
Nothing but to agree with that myth, when playing with the demo you mostly perfect the strategy and there's flowing fake money around
but once you start using your real money, everything will not go according to your plan. Losing is not impossible even you think that you are using the best
strategy that you know, the outcome is mostly not favoring you.