I've worked for both companies for many years (not just a seasonal employee.)
Busch USED to be amazing. When the Busch family owned the parks, there was a level and quality and service unmatched elsewhere. Once they sold to Blackstone, things went downhill fast.
This past summer, Cedar Point celebrated its 150th with tons of show including a MASSIVE one with a cast of over 70 people. This past Christmas, Sea World could not be bothered to bring back "Oh Wondrous Night," their award winning Christmas show and instead got groups to fill in on weekends. It was lackluster and cheap and showed how different these two parks are in their commitment to entertainment.
There is just no comparison between the companies and their two philosophies. Cedar Fair has been around for 150+ years and is an ENTERTAINMENT company. Sea World is owned by Blackstone, an investment firm. They just see the parks as money makers and way to make dividends off of their stocks.
And until Sea World Orlando can retain a president for more than one year, they are in no business to be buying other properties.