Web 2.0s and link Tier Building

When I build a web 2.0 should I just blast them with bad links from Fiverr, or should I tier them, build another bad spun web 2.0 and blast those web 2.0s with tons of links then use that link to juice to main 2.0s with better content then to my Money site. Also if I get expired web 2.0s should I bother using links to them.

Which are the best types of links to blast them with?