

Because the people paying them think they’re going to earn it back.
When you are a well-known or household name, your presence alone can convince a lot of people to watch whatever product you’re in. Not just that, entertainment is inherently a risky business. Replacing unknowns with celebrities means reducing that risk, replacing it with known factors.
In other words, because the market thinks they’re worth it.
You just can’t make this up. Satire is dead.