If you look at the economics, while several states have legalized Mj to some extent, the majority of them don't allow growing. Now, take a look at the seed bank on this forum. There are a zillion vendors selling a zillion strains, with each claiming to have their own strain that is being sold a bunch of other places as well. Many newer companies are just guys who got a few decent plants and grew a batch of seeds... again, untested and full of issues. Growing a great strain is a great ambition, but it takes a lot of work and twice as much patience and record keeping. The shame of it now is that the old school strains are being lost to the new hybrid and auto craze. I guess it's like wine making. Some vinyards have a truly great wine, while others grow for the volume and the ease. One is designed to make money and one usually eeeks by for decades before it gets it's recognition... IF they can make a unique and quality product that is easily differentiated from most other vintages. In today's seed world, big money and big buds are the craze. There are certainly some great and legendary strains still out there, but they are often only shared by long time friends and not available for the world...yet. I have a strain from the Alaska pipeline construction days that was popular with the workers. It is called Matanuska Thunderf**k and is pretty much considered extinct as a strain. It isn't nearly as strong as some of the heavy THC strains today brings, but for the time and conditions, they were killers. Remember, these were popular in the days when Mexican was giving way to Colombian... everything was mostly Sativa.
So, after a long ramble, growing seeds and planning on making money is a great ambition, ut you have so much competition that it is gonna be difficult. Selling your experiments can always py the bills if you are in an area that allows that, so you have a lot of thinking and planning ahead. You need something that makes you stand out as something special. Build a better mousetrap and the world will buy it and beat down your door... or something like that! Good Luck in your endeavors.