The goal should be to establish a fan base, not get more subscribers. Sure, the number of subscribers you have comes into play for YouTube's video ranking system, but not nearly as much as quality and frequency of content. Another factor that became of utmost importance somewhat recently is viewer retention. If you're uploading 10-minute videos and people only watch them for 10 seconds, you will not be ranked well by the system.
Point being get active subs, not just subs for the sake of subs.