Just out of sheer curiosity, what do you plan on doing with the offspring? Not to be too blunt, but king bettas aren't as appealing to buyers as they are more drab in colors and finnage. They tend to be less flashy and unique, which are what most common day buyers want. I'm not saying no one likes king bettas by any means, but if you plan on trying to sell them to your LPS or local townspeople, or even put them in auctions online, you won't get nearly as much interest as if you were to sell regular HM/DT/DeT/HMPK/CT.
Are you prepared to house, feed, filter, heat, clean and treat (when ill) an upwards of 200 leftover offspring from this spawn that no one will buy? Do you have means to separate all of the males and keep them happy and healthy?
Again, not trying to be rude or uppity, but when breeding bettas you have to be prepared from ALL angles, and think through every "what if" scenario.