Usually salespeoples' pay is highly incentivized: I doubt the base salary of those salespeople is $300k. Those $300k people are probably bringing in millions of dollars of revenue apiece. Firing them will reduce operating expenses some, but drastically reduce income as well, unless they're replaced with something else.
Sales managers will just hand the accounts to new executives. It's not as if the business walks away because their AE isn't there anymore. They're spending money on twitter for the benefits it brings them, not to do favors for their favorite executive.
> It's not as if the business walks away because their AE isn't there anymore.
They absolutely will. Media buyers for the gigantic companies expect to be wined and dined very aggressively. Early in my career I worked for an agency that had a couple truly massive EU companies as clients. You know these names. I saw first hand that the personal charisma and relationship of the agency owner was the only reason those execs kept coming back. And he went to very great lengths to stroke their egos.
With buyers that big, there's always another agency. So as soon as the buyer doesn't like something, buh bye.