I have a pr0 that is only 4 months old and PR prediction is PR4 right now.I bought a few unrelated pr5 links for it which tends to be cheaper than buying gambling links and as long as you do have more gambling links even if they are pr0 i think it will help get your PR UP.
SERPS is more important than PR and there are lots of PR0 sites in top of the search engines.
I think blogging and article writing is best thing you can do for traffic , my pr0 is getting 80-140 hits a day because i write in my blog just about my own experience gambling .If you own it then you can also put your own tags in the blog.Count on 6 months – 1 year before you see it paying off. Any one of us making 100% of our living on this can tell you this is like having 3 full time jobs in the beginning but over time it gets easier unless you are dumb like me and keep buying websites and always have one or 2 on the bottom lol.