Many do, and there is certainly nothing wrong with that either...
you like what you like!! There is a richness to darkly roasted coffee that appeals to many for sure (I.e. if you like Starbucks, you are likely one of these people). Personally, I cannot drink a Starbucks coffee...even their lightest roasts are too dark to me, but my wife loves them. I prefer very light to slightly medium roasts that are bright and fruity, citrus, berry flavored, maybe some nut flavors etc.
@Rich G does some nice roasting from what I have seen on his posts here. I haven't roasted my own beans in years as I work with some local coffee roasting companies that used to carry my espresso equipment before I sold my company.
Industry "secret"...darkly roasted beans hide many faults in a bean, and also let's you roast different varietals of beans, but come out with the same general flavor in the end. When you lightly roast a bean, it's real flavor really comes through (bad or good) so you have to be more choosy of the green beans you buy, roast them more carefully with different roast profiles etc. This also translates into more effort, and higher costs too. Some of the best coffees that I love cost around $50-$60 a kilo here (my "special" occasion beans). Just like grapes for wines, some years crops from some areas are just unique and rare and sell for much higher. You would never buy these green beans then roast them dark as you would just be rolling over what makes them better than your average bean,
Companies like Starbucks buy coffee in huge bulk (and typically the low-end" beans) and then blend and mix and roast dark to get their consistent end product...there is no way they could do that if they roasted light to medium like artisan roasters do.