#1 Why they shouldn't: Discouraging for other superstars
Let's face it, no wrestler loves the fact that Brock Lesnar get paid millions of dollars in a year for a handful of matches while they could hardly make a quarter of it despite wrestling over 200 matches a year. Brock Lesnar's lucrative contract is like a dream job for many people. However, this does not send a very positive message for other wrestlers on the roster.
There are wrestlers who work way harder than Brock does and despite being extremely worthy, have to be on the sidelines because a part-timer like Brock Lesnar hogs the spotlight in the big events.
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The situation has also led to many superstars asking for a contract similar to Brock Lesnar. Fewer matches and more pay. WWE could not afford to give similar contracts to many people and cannot risk losing them either. So a wise decision would be to let go of Brock Lesnar.