Because it simply doesn't work like that. Almost no one makes a profit, the entire MT industry is based around no one makes a profit. If you do they have methods of making sure you don't.
The figures are public for the US industry, which is dismal and the rest of the world isn't doing any better. Basically there really aren't many retail fx traders making money. Maybe 10 to 100 in 100 000 ?!
So if you go after 5 mins in 30 000 you are really, really exponentially fucked. Takes a special level of stupidity to go after something that almost never happens.