I highly recommend you just wait until you hit 1000 subs. The amount of money you'll earn would be tiny until you get to that point.
Look up Union for Gamers / Curse they offer 90/10 split with NO LOCK IN. Only 1000 subs needed.
Why, people, you so much value those subscribers count as a requirement to join?
Partners (and, of course, Networks) getting money for video views count that shows ads, not for subscribers count. There is no logic to look at subscribers count.
I do not need to go far to look for samples, and telling from own experience.
On one channel my daily average stats:
Views: 5k+ (daily)
Subscribers: ~3 (daily)
So by doing simple math (for easier calculation lets take the point that traffic would be the same every day, which in most cases not true
but the percent of views vs subscribers would stay similar) i would reach 1k subs (naturally, without incentives) in about a year, when i already would have ~2M views at that moment (unmonetized 2M views!, because i would be waiting when i hit 1k subs before apply to Network
).
Another way - by going for incentive (useless) subs i can reach that amount (1k subs) in few days without much hassle.
So, again, I do not see any logic to give so much value to the number of subscribers because it doesnt nessesery affect views count of videos.
The natural & quality views count of the videos, is what matters the most, imho.
(of course video quality should be not be very bad too)