Hi
Creating a load of new WP is a waste of time, they will take a couple of days to get indexed sure, but the main problem is there will be no authority to these new sites. Therefore they will be useless.
Instead it is a lot better to create links on already very authoritative sites. I have a massive list of high page rank sites in which I can create links for you. For $100 I can create 200 links on different high PR sites, and I will interlink them into a link wheel, and then ping all of the sites after 30 days to ensure each link is indexed.
This WILL increase your site strength, and could even see you get to the top of your niche depending on competition.
Let me know if you have any questions.
Regards
Andy