Fan Pages and Ladders

We all have been using fan pages on Facebook for business, they're a great thing to get yourself out there and spread the word about your business, cause, or what ever it is you have one for.  There are pages that do like ladders and shout outs that are a great way to build fans. You can gain hundreds of likes very quickly using these ladders. It almost gets addicting!
Something that kind of bothered me was that I notice people will like a page to get likes and then go back and unlike them. I'm pretty sure this is bad etiquette in the "liking ladder" world. If you are using these ladders, remember, people are all using them for the same result so please don't like then unlike pages once you get yours liked. Most of these ladder pages have rules and the main one is "play fair". JMHO - pm