Personally, brewing a clone for clone's sake has no interest to me. One of the main reasons I homebrew is the whole creative side. If something is already available to me commercially then there's not a big reason for me to brew the same thing.
Having said that, if I taste something in a commercial beer that I like, then I would consider trying a clone. Say there's a porter that I really enjoy the roast quality of. By brewing something in the same ballpark I can figure out how to get that type of roast character in my brew. Now I "own" that and can add it to my toolkit for designing future brews. To me that's the real benefit of a clone, not so much to put 5 gallons of a beer I'd normally buy at the store on tap.