You read it on the Internet, so it must be true.....
It's actually a load of cack. Most high lifts have a 2:1 mix ratio, and adding too much peroxide will not make it lift more (keep it moist lol). What it will do is give you a nice chemical burn through over exposure and too much nascent oxygen release.
Go to a hairdresser or a college if you want cheap hair.
Oh, and please stop abusing the professionals for simply telling you the truth.