With a starting capital of $15,000 surely you can make $5,000 profit through day trading in a month and you can earn more than that depending on your capacity and skills you have in trading. The amount you can earn depends duly on your own self because if you are bad at it, then the possibility could turn things the other way around. So be mindful before engaging on such, you must be knowledgeable enough on managing your assets and funds to somehow assure your earnings by the end of the month.
Well, I think it still needs knowledge and skills and this possible profit that you would be an earning will matter on this way. Perhaps it really depends on your skills, the large amount of capital is useless if you don't have an idea on how to start trading. Trading is a very risky and crucial activity that is possible in just a matter of a day, your large capital will easily wipe out in your wrong move in trading. So therefore, there is no guarantee that there is a good return in trading if you do0nt have skills.