I rather meant that the offer to fix the product by firmware updating, isn't going to be around for ever. Once all first hand buyers are done and dealt with, the issue is gone, and a second hand buyer coming up with a second hand card in 6 months, or 10 years isn't necessarily able to get your help with the fix.
Which is also true for a first hand buyer that has a issue arise in a few years time...
As i said, it has nothing with frowning on second hand buyers or seeing them as a second class customer, it's just that your responsibilities as the manufacturer has at that point long since ended. To some extent you can still provide services for a fee, or as goodwill, but it's not worth counting on it. Even if we have grown accustom to manufacturers being able to provide manuals for decades, and then some...