Why not just keep the product in 37Signals if it's a profitable product? "not to get dragged into the day to day of each and every business or product"; 37S ha

Why not just keep the product in 37Signals if it's a profitable product? "not to get dragged into the day to day of each and every business or product"; 37S has a successful history of getting into the day to day of every business and product, that's what they do exceptionally well. Why change that?