True. For awhile, we used to have an extra "computer only" line but eventually had to drop it and revert back to a single line. So now, for the same reasons like yours, I perform most of my online work in the late night tile early morning too.
There are advantages to having dial up, though, if you game online. Your ping and lag is far, far better than if you use strictly satellite....as my son found out playing WoW. He has his own dial up connection and used to play the game with it. Then he later added WB because of Blizzard's occasional huge patch downloads (among other reasons). Yet while playing the game, he found areas where it was better to keep using his dial up than with WB. Against the faster connected players in a Multiplayer game, dial up can be an advantage for survival.
He knows the reason "why" but it is one of those "go figure" bits anyway. Overall, dial up users have learned to adapt, overcome and "make do".