Pro sports bettors are bettors who make money, that's it.
Never claim yourself to be pros if you not making money, winning chance is just an illusion and not always in profit.
This is similar like business owner, they only mention the total sales instead of the total profit, if the sales is $5 Million but the expense he spent $4.999.999, he only earn $1

The difference between we and them is the skills.