In addition to the funders who pay only 50% on renewals the ones that contractually demand 1st right of refusal on every single submission are to be avoided like the plague. As others on this thread have stated perhaps sooner or later they'll realize they're costing themselves business and change their ways but in the case of a behemoth like CAN probably not owing to their large inside sales force. It certainly isn't difficult to find funders willing to pay full commissions on renewals and who don't demand 1st right of refusal on every single submission.