Cisco Smartnet for 6509E Line Cards

Can anyone comment on Cisco 6509E Smartnet "chassis" coverage? In the past, "chassis" has always meant, not just the passive chassis itself, but all of the components including supervisor cards, line cards, power supplies, fan trays, etc. Now it appears that Cisco is requiring Smartnet coverage on line cards in addition to the chassis. My understanding is that Smartnet functioned much like insurance policies, where Cisco collected maintenance contract fees year after year, but the devices were generally so reliable that the collected Smartnet fees always far exceeded the dollar amount required to replace failed components. Regards, David