Why don't you just buy a 6 string and tune that lower and make the 6th string the lowest string?
because, you lose the high strings. Some might argue, tuning that low, you just dont use them, but i like the comfort of them being there in case i might need them, than needing them and they're nowhere to be found.
Also, 8 strings just look so much cooler playing that sort of music :D
another thing, most, if not all 8 strings have their tuning pegs already modified, so the strings fit into the low 2 tuners (up to 80)
i have problems fitting a 62 into the low E tuner on my jackson, so i'd have to drill it out.
