Steep Turn
One should adopt a similar policy with legacy Cessnas so far as the SIDS programme goes. Before purchase, the prospective owner should research the cost of the SIDS programme.
I know in the US, and possibly Canada, SIDS are not mandatory for private or Part 91 ops however in many parts of the world SIDS are mandatory for private ops. As a result there are a good few legacy Cessnas that have been permanently grounded due to the cost of complying with the SIDS.