Hexane can be reformed to benzene (at 500o
C, 40atm using Al2
catalyst). Benzene is a relatively valuable hydrocarbon, so it is economical to do this reaction, even though benzene can be extracted from coal (destructive distillation to coal tar and fractional distillation) and made by the polymerisation of ethyne.
The reason oil compainies do reforming, alkylation, cracking and platforming (using platinum as catalyst, often allowing lower pressures to be used) is because they produce hydrocarbons with a higher value/quality.
Hope this answers your question