This is the biggest problem of gaming - people are usually interested in buying a game they already know (with the same gameplay mechanics, with similar graphics, with cliche characters, with crappy storyline, similar to everything they've seen). Thus real gems, shining with originality, beauty and taste, are most of the time overlooked under the piles of crap - and don't become smashing hits.
Beyond Good & Evil is one of such games - overlooked, underappreciated, known and loved by few.
So if you're looking for something different, original, beautiful - get your ass and buy it. It's a deal you'll never, ever, regret.