It is rarely ever a good idea to try to make money all the time. There is no way and no human in this world that could make money constantly, look at warren buffet, he is the best investor in the whole world and check out his yearly paper where you can see his past performances as well, he had years he lost money instead of making money as well which means even tough in the long run he is successful he is just another human who can't make money out of thin air and loses when the market crashes.

It means for 15-30 dollars a day you would need to be a magician, of course you can make that much money some days but there will be days where you lose that much money and maybe even more, however if you hang in there and continue there is a chance of making profit in the long term.