There are lots of reasons to go organic besides just the potential health benefits and personal beliefs. And, as someone mentioned earlier, there are cheap and expensive ways of doing it. There are also work-intensive and lazy ways of doing it.
I'm cheap and lazy.
I'm not 100% organic, but I do use mostly organic nutes in my homemade mix (I use miracle grow non-organic as my base). To me, not adding any mineral nutes past the point of the original stuff in the miracle grow soil makes for a much more pleasurable tasting end product than when I used to use regular non-organic fertilizers. Blood meal, bone meal, dolomite, cow poop, and epsom salt are also pretty cheap and go a long way.
Plus, I have a favorite strain that eats nitrogen like candy, so I'm able to mix really hot soil up with some blood meal and not even have to worry about adding anymore the whole grow (flowering several days after the clones root). Bone meal added into the soil mix for my SOG does just as well as any non-organic hi-P fert I've personally used before (granted I've only used 2).
For my fave strain, I've got a soil mix to the point that I pretty much don't have to touch it for the whole grow besides watering. It *occasionally* starts running a little low on N a week or two early, but for a casual grower like myself, the fact that I spend less time paying attention to nutrient needs is worth it in and of itself.
Unfortunately, you have to experiment on strains with fast-breakdown organic nutes like blood meal, because I've burnt the shit out of a lot of plants, and a single flush doesn't always fix the problem like it usually did with mineral nutes. But man, once you get it down...well, it's been a lot less work for me (contrary to hbstoner's experience).
Now, I'm sure there are others that put a whole lot more effort into organics in different types of grows, and they probably get better results as well. I'm also sure that you can produce some really nice-tasting stuff and get really good at growing with non-organics. But, I've gotten bountiful, tasty, relatively predictable results with very little ongoing effort using stuff that probably costs less than a meal for two at a fast food joint. I had to experiment and take some notes for a couple of grows, but omg...totally worth it.
Last but not least, the taste of my semi-organic bud totally compliments genetically modified beef.