No he's not being sarcastic. It's not very cost effective or convenient to use Toluene to raise 87 octane to an available 93 octane. Most folks use it, as psudaytona stated, to obtain octane leevls that are not easily available, ie 100 octane where race gas is not easily available. They do this to reach HP levels not attainable on 93 pump for a given engine (ie. on turbocharged apps, it allows them to increase boost to levels that would cause knocking/detonation on 93).
The folks who do this commonly add anywhere from 2-4 gallons of Toluene to a 15-20 gallon tank.
Max