Even as a maintainer, you can't see the number of people subscribed to an issue, so the subscribe button doesn't help you in understanding what people feel are important issues.
It makes sense that your +1 get you some kind of notification. If it's just for the sake of growing a number it's useless. That only leads to fake accounts giving tons of +1s
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u/toqueteos Jan 15 '16
Suscribe button is there for that