Why would you want to sub 4 sub? Why would you want subscribers who do not even watch your videos. Your subscription page is supposed to be a place you can chill out and watch videos that you like, why would you want to turn it into a spam box???
Just my advice though, do not go down that road. My advice is just earn subscribers. I would rather have 50 active and happy subscribers then 4000 subscribers who don't give a sh*t about me.