Surprizingly that's not really true. Most are sold to people who who could not even explain what "f-stop" means. Most SLRs are used as over sized point and shoots.
Yo would think only those who know something would buy them but what's happened is tow things (1) the price of the low end cameras has fallen and (2) the level is automation is now such that a camera can be left on full auto.
BTW, Always buy the kit lens. Both Nikon and Canon sell them nearly at cost and at least in the case of Nikon the kit lens are very god quality and very good values. Then after you shoot the first 1,000 frame buy a second lens. Beginners have no way to know what lens they will want. Almost all beginners thing they want some big 200mm f/5/6 zoom but only later find they leave that lens at home. The "kit" lens I got was the Nikon 18-70mm f/4.5 and it is about right for 60% of general photography. I already have a collection of lenses going way back to manual focus film bodies
I can't see why you'd buy a £500+ camera only to leave it on auto all the time, you'll never reach any of it's potential... Ta about the lens advice, guess I'll stick it out with the kit and go from there.