The link in my sig is a commercial grow. This is a hobbyist looking to expand. That's cool though, dont sweat the terminology too much people read a lot into things sometimes.
Weed grows in the wild, yes. We buy it as Mexican Brick Weed. Its shit, poorly watered, poor nutrients if anything other than just dirt. To grow GOOD weed, you need to be attentive to the plants. Indoors you better be available at LEAST every 2 or 3 days. I dont even like going more than a few hours.
Since each day the plant does something different, whether it be growing, or budding, or finishing up, the days that you have fucked up plants are going to stunt your ENTIRE grow. Fuck it up in veg, and you'll have a terrible flower. Light didnt turn off for 3 days in flower? Dont mind the seeds then. etc etc etc.....
Watch a few grow DVD's, it'll give you an idea of what to do. It isnt a get rich quick scheme, most folks use a year of growing to really nail things down.