the reason these are seen on all the food tv shows is duofold, one they are great mixers and secondly there is a placement contract between kitchen aid and food tv. you will never see a bosc, which is a great mixer for most things but the newer ones with the plastic whip bowls are a bad choice and not the best choice for bread makers as they tend to get hot but overal a very good mixer. you will also never see a hobart or electrolux magic mill which save for plastic whipping bowls are superior both in size and most other aspects to the kitchen aid, they also have the cost to match.
As a caterer and personal chef, i own a 4 1/2 kitchen aid (which would be the only one i would own or need if i wasn't doing professional cooking), a 6 qt kitchen aid which was my first mixer purchase but could find no reason to buy now except for the added power which makes the flour mill go at a better pace for longer periods of time and makes my sausage making go faster. however since most people won't buy the grain mill either for making flour or cracking grains for brewing (I do both) or make 150 to 400 pounds of sausage a month like i do the 6 qt really is over kill not to mention is it is too big for most people who only make enough merringue or whipped cream for one or 2 pies t a time. the thrid mixer s an electrolux magic mill which is the primary mixer I use for bread baking and I can make and knead up to 7 loaves at a time with ease, but the $500+ cost is a little prohibitive for most people