When it comes down to this situation, and you click on it, it can literally cost you a game:
It's been a close game, all you both have left is Nexus Turrets, respawn time is over 40 seconds now, and suddenly when you're going for a kill as they retreat up their stairs, you click the store... and die. You were the last person on your team alive... and now the entire other team has respawned.
Situations like that should not be disrupted by that imo. Maybe move the store to the back of their base would be another solution.