Rolling a Book of Business

I'm looking to get a better understanding of rolling a book of business for future reference. At what point did or would you decide to do roll it, when the commisions are higher at another company, when rates start getting out of hand or when things aren't working out with that company? Do you roll at renewal, do you do it right away or gradually? Do companies care when you roll it or is it just part of the business? I'm assuming you tell the clients the rates are better with ABC company?

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