it's simple, outdated version is not supported anymore. You even get updates for no money for your old version. That's best thing, you can expect from a software company. Besides blizzard, there arent many that keep supporting their software that long, but even with StarCraft 1.01 you wont be really able to play anymore online, you have to upgrade, even if you might love the balancing better the old way, you have to upgrade.
What you experience is the same for everyone with old versions, where upgrades exist: They arent supported anymore, get used to it.