^ You miss my point entirely dude, I am pointing out the simple logic that the people who produce a product are the ones who ultimately get to set a price for it, bearing this in mind, it would make no sense for the price to be set at a level which they are not making any profit.
The claim growing cannabis does not work out cheaper than buying it is fairly naive, it suggests to me that you think people who do grow for profit are either not making very much money or require very expensive equipment and/or a great deal of experience to consistently pull highly profitable yields. In my experience, none of these things are true.
Obviously, the potential to make money from growing cannabis is less in a legal market than it is in a black market, because the illicit nature of a substance inflates its value without considerably increasing the costs involved in producing it (for cannabis at least). However, I am aware of the going rate for cannabis in legal and medicinal States of the US, and I know from experience that a reasonably inexperienced grower could easily be pulling down a lot more weed for an equivalent amount of time and money than they could buy for a similar value at the retail level.
Your time is money argument also fails to account for the fact that many do not consider growing to be work, if you are a long term daily smoker with a genuine passion for the plant, then the 20-45 minutes you spend on your grow each day is not likely to be viewed as much of a chore.
I don't have a problem with you, and I can see how the way I started my first post in this thread could be taken as disrespectful towards you, I apologise for that. However, in regards to your personal experience dictating that it is hard to undercut retail prices for cannabis, I have to suggest that the problem likely lies in your skill as a grower, because saving money is precisely the reason most growers I know took up the hobby, and they are far from struggling to accomplish this.
The fact that you view growing as such an effort and not worth your time is likely a major factor in your lack of success as a grower, most people I know who have a passion for growing tend to be pulling reasonably impressive numbers within a few grows.