Let's be honest, does anyone buy pink/control wards when their team is losing?
People say wards win wars, and yes I agree. But if your team is losing and your team isn't able to defend them, what's the point? People will just destroy them, and since you can't fight the enemy there's nothing you can do about it (actually you can try to defend them but probably die). I feel like pink (even though they don't exist anymore) and control wards (and wards in general) are just a luxury item you can afford to waste gold on when your team is snowballing. You're not on the snowballing team? Too bad so sad. No vision for you.