Probability question for the experienced guys?

For the past few days, i was making consistent profits in intraday. I was elated. Today i had a chance to book my profits too. But the profits i was about to make today was less than yesterday. So I got emotional and greedy. Decided to wait. Thats when things turned upside down, and by the end of the day i booked a loss.

Lesson learnt : Intraday is an emotionless game, market showed me today what happens if i play emotionally. Will be careful next time.

So I would love to know from experienced guys here, what is the probability of wins and losses if you day trade everyday with little emotions? Is it really 50-50 as some traders say?