The extortionate renewal rates I saw as a gift from Broadcom. It made it very easy to price the risk of doing nothing and be sure that the cost of outages during and immediately post-migration would be lower. (Yes, we had a few, due to obscure drivers issues or an app that really wanted a specific CPU or chipset or virtual NIC, and they cost us less than 10%, probably closer to 5%, of what the proposed renewal would have cost.)