For the same reason we all do:
Play through 4 shitty, complete waste of time games where someone either drops, crashes, goes afk or fails horribly... or against a complete stack team, or against a complete noob team...
Until, in the 5th game, if you're really lucky, you have a good team on vent vs another good team on vent and it turns into an epic 60 minute game of awesomeness.
It's that 5th game that keeps us chasing the EiR dream... trudging through the slime in the faint hope of glory.
true story bro