It's because Cheese is a "workable" cut / clone. Most "clone-onlys" are whack and make pathetic "workable" plants IMO (less than 75% rate is compost these ends). I n I talking returns over a tray of 50-100 clones,,, so not connoisseur grade dope here,, by a long standard!
Cheese is fast,, reliable,, semi-wooded (roots well), takes to most mediums like a duck to water... and usually get ppl stoned out there faces! The ppl that buy the stuff from dealers cant get enough of the stuff quick enough,, often fiending for it before they even smoked it ! That's why dude!
Obviously there's better dope around,, but none quite as popular on road in UK with commercial smokers,, for an 8weeker.
...give an extra 2-3 weeks n Jack Herer kills it all round!