I am opening this thread as opposed to all the publicity you have received about day trading. It is a very falsely marketed activity, on a par with MLM businesses, with the difference that the latter tend to advertise in smaller niches.
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Your perception is wrong and the advice is not smart, day-trading is part of trading styles that have "blessed but also ruined" people's finances just like any other style of trading you can talk about, holygrail doesn't exist in trading. Still, if you know your day-trading strategy very well, manage/plan your trade rightly and are disciplined, then you will have good results. However, trading is risky, it is either you risk it or leave it.
Nevertheless, I agree with you on those brokers/exchanges making more money through day-trading. This is why I open a maximum of 1-2 trades daily. Although the practice is in line with a good day-trade practice and the gainable amount is not too big for the service they render.