Why not? Not everyone plays a game for a year and then discards it. Same goes for Franchises and Rosters. A look on any of these forums will show you people still clamoring for and downloading rosters from over a decade ago. If I sink my time into something, I don't want it cut off when they decide to prematurely take their servers down.
And your wrong about people not playing it now. Not everyone who uses classic rosters, in fact most, don't post on here.