I'm not saying this is a bad idea. But I must admit, I can not see the point in it. I have been up all night, working, so maybe that's why.
The questions, that are slowly crawling through my head right now, and I am yet unable to answer myself:
1) What good would a sub do, if it is done as a favor? If the subber does not like my content, and will unsub in a little while, what would the benefit, in the long run be?
2) Why would I sub to someone, when I can't see the their content interesting me? My sub feed is getting so many posts on daily basis anyway, that often I have trouble watching all the videos. Good thing the bell icon can be unchecked, that my phone does not go mental, during the few hours of sleep, I sometimes get. Sure all people are not like me, some might sub to anything related to bikes, but I tend to choose, what I watch. I bet there are others, who do that too.
3) If you happen to have a very small channel. Wouldn't the amount of subs multiplying, in short time, scare you? I know it would scare me.
4) When will the sun get up? It's so darn dark here.