Best of albums are a con really tho - for fans there's little point as you have all the songs anyway (unless there are maybe a couple of previously unreleased songs on it, in which case it's more of a con to get you to buy an album filled with songs you already have, just to get two new ones)

I don't do "Best Of" albums, except for two things. 1) it's from a band I don't really know a lot of stuff, but kinda like. For example, I like Morrissey, but don't know most of his stuff since The Smiths, so I got his best off to have a random collection of songs. And 2) if it's to complete or add to a serious record collection. Example - I own virtually every Metallica record going (and gone) but if they release a best off, I'll buy it, purely to complete my record collection.