EVERY game that I have ever had to date, was supported for all those who bought it, until it was no longer supported at all, for anyone. No company has ever charged additional money for support or updates beyond the initial cost of the game (MMORPGs excluded by their nature) to my knowledge. Diablo and Diablo 2, for instance, has had support for well beyond a year's time. Battle.net, part of Diablo, also fits this bill. Does my giving you examples change anything? I don't think it will, so I don't think it's relevant. I could scour the 'net if need be to find other companies that have patched their games after a year. Will this make a difference in your companies policy?
~SDC~