Yes, they should produce larger cubes if and only if there's a significant demand for them to justify a production run.
I honestly don't believe that there are enough competitors that would commit to purchasing larger cubes to justify the cost of a production run though. There's a mere 530 competitors that have competed in 7x7, compared to 11857 competitors that have competed in 3x3. Now consider that fact that over 350 million Rubik's Cubes have been sold, and add KOs/copies to that list.
There are other distribution channels to consider beside competitions. We do have a little bit of influence in that the use of such cubes in competitions provides free promotion, especially if there's media coverage. But if they're not being stocked in every toy store across the country then it's unlikely that someone will purchase it as a gift.
If you just simply want an 8x8 or 9x9 then you can make one yourself for a few thousand dollars.
If you want to compete with an 8x8 or 9x9 then consider the impact it will have on organisers. Similar discussions were had with 6x6 and 7x7 but it's painfully clear as to how many people practice 7x7 and are fast in competition. Such a low number would not justify a production run.
You could possibly take it one step further, contact Verdes, try to come up with a licensing agreement, and manufacturer some 8x8 and 9x9's yourself while paying Verdes a small portion if you honestly believe there's a significant demand for these puzzles. In all likelihood you'll be out a few thousand dollars while attempting this to say the least. So why would you wish this upon somebody else?
This thread was constructed with the view that you believed people hate you. I'd recommend just setting that aside, avoid conflict, and spend more time constructing your questions so that it's easier for others to give a concise answer. People will stop flaming/trolling you if you do the same and treat others with respect. And even if they don't, not responding to their post directly will make it easier for moderators to clean up the forum.
Tim.