Ive never tried it so dont take my word, but id launch like 80 MFA ( made for adsense ) sites and try to promote all of them by WOM ( word of mouth ) as good as possible, SEO , good keywords/meta tags, etc. Think if each one earned a measily $0.50 a day, thats $40 a day - Do the math
.info domains for $0.99 that is ( for the 80 sites )