Here's the problem as I see it. You might get away with abusing your voice for a while but ultimately it will leave you. But there are the Louis Armstrongs and Tom Waits who do it all wrong but survive somehow.

There are in the meantime stop-gaps to keep from going hoarse but they must be short lived. A singing voice when used correctly should last a long time. Unfortunately, white rock singers who emulate a "black" singing style don't have the equipment necessary to withstand the battering. Interesting is that African-American singing styles seem to be free of the belting rock tradition and somehow because of the facial mask and throat, their voices last.

Many vocal teachers won't be able to help you much because if you "fry" your voice, they consider this an aberation.

Consider the longevity of your average rock band.

Frank