What the founders know - and are telling investors - is they have an offer to sell the company and they don't want to take it, but it's so much money they'd be

What the founders know - and are telling investors - is they have an offer to sell the company and they don't want to take it, but it's so much money they'd be stupid not to. The investors want the company to keep going -- and growing -- so they cash out the founders a bit to make sure everyone is aligned on the same goal: to make a huge company.