It's a nice gesture, and appreciate your efforts to get people on here.
Is it that there are a lot of people not posting, or not even registered? What's the traffic like? Also, will this encourage people to keep active on here? I think that is the key - not only getting new people on here but getting more new/partially new/more regular members more active on the site. To be a devil's advocate, I'm skeptical that rep and post count will make much of a difference.
Have you had any feedback from new users in general about the site? Could it be lack of awareness? Could it be paying for a guide that can be obtained for free elsewhere? I don't question the quality, I just wonder the combination of a new-ish site, a site more associated with hockey and paying for something might not be the more enticing way to bring people in. Maybe some kind of discount on the guide for some new users over a period of time? To get them in and check out the quality?
Anyway, just a few thoughts. Keep up the good work. Looking forward to becoming more active once the baseball season starts to draw near.
EDIT: I realise that the forum and guide are different things, and that they could use the site for free. But I wonder if people are sticking to more established sites with more traffic and information. But if you offer a quality guide at a discount (or even free for a short time), it might get a few more people in and in realising the quality, will use the forums more often.
If I can think of anything else, will post it here.