Milenochka (what a nice user name!), the Join4Likes.com site has AlexaRank over 1 million, you must be the only user there...
Their low-quality traffic is useless, unless you run some short-term blackhat SEO project. some of these bot-likes might disappear as quickly as they've appeared -- you cannot control that. And, besides, in SMM they now tend more to consider factors like " how many are talking about" than the number of likes. All kinds of pop-singers have millions of likes but the ads on them costs really funny money -- it's a crappy come-and-go traffic. Lots of Indian likes looks like lots of Indian likes, lots of one-day account likes doesn't look like lots of likes from really developed accounts.
I wouldn't say it is entirely worthless. People are more likely to click the like button on a page that has 1500 likes than they are if they page only has 10 likes. It has it's place, as long as you don't convince yourself that you really have that many people seeing your posts.
Hmmmm this is the first time I've heard of optimizing Facebook pages for facebook searches. Interesting post thanks for sharing.