Tournament prize funds come from the SPS inflation pool, not from pack sales, so this will not affect tournament prizes at all.

You are right that we would likely earn much more in the short term if we kept 100% of the profits from the Rebellion sale. In the long run, however, we feel it will be much better for the company if more of the value goes to the DAO. So we are purposely offering to give up significant short-term revenue in order to build a long-term benefit for the entire ecosystem.