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1. SCs are limited to certain HP numbers vs a turbo set up.
2. Most people who want tons of power don't road race, they drag.
3. Turbos are more easily fabricated. You can't make a roots/eaton/whatever blower yourself. Just grab a snail, bend some pipes (exaggerating) and have at it.
Most SCs in say a Honda application will "magnify" (for the lack of a better term) the powerband; more low end TQ etc. You'd be lucky to reach 100hp+ max power for a bolt on race kit.
Turbos on the other hand will always achieve more power. Sure the powerband would suck for anything but drag racing (especially if its a big turbo) but you're getting 200+hp for the same money spent vs the SC setup.
A nice SC set up are great for the street, but people are always chasing numbers and turbos just provide more.
SCs do have problems as well. You need to make sure it's oiled, tighten pulleys/check belts on occasion, and monitor your cooling and A/F on a regular basis. Plus most cheap bolt on SC's don't have a cooling aspect, like say an intercooler, so you'd have to be careful about things like heatsoak and all of that.
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