Why mess with cows? To some people that's like asking, "Why mess with food?" Or breathing air.
Some folks just have it in their blood to want to mess with cows...of course, once you run enough of that blood out on barbed wire, into bruises, and out of your pores, sometimes the messing with cows part runs out with it. You can get cured of this blood disease in short order. Having to fix up a few miles of fence will do it for sure as will a kick.
Standing around watching your cows eat, calves nurse, a bull sniffing around, etc. while you lean against the bed of a pickup just does something for some folks. And if you can loop a few years together of decent auction checks, a couple of decent private treaty sales, and even some rain, hell, you might even break even.
Best of luck! BTW, I recommend the breed that is most common in your area and sells easiest. Go to a commercial auction and just watch what people are buying. At first you may not be able to tell what they are looking for as it all goes within a few pennies per pound difference. After a while, with good notes, you will see that maybe baldies are paying a few cents more a pound, or longer bodies, etc. It is different everywhere--you have to see what sells in your neck of the woods.