Things They Should Invent: "if you like...you may like..." for beauty products

I use Beautypedia, but I don't always agree with their reviews.  For example, they give my favourite eyeliner a poor rating, saying that the long skinny brush is hard to control.  But I find that the brush is easier to control specifically because it's long and skinny, and I vastly prefer it to every other brand I've tried, whose applicators are all too thick for the look I'm going for.

This means that when I'm in the market for eyeliner, Beautypedia is useless for me.

And it might also be less than perfectly useful for other products, and I'm just unaware of it.  The perfect product for me might be sitting under some pile of average reviews on Beautypedia and Makeup Alley etc., because it isn't optimal for most people in the world but is perfect for my non-standard needs.

So I'd like to see a beauty product review site that compares products to other products.  If you find Product A and Product B very similar, you say so, and perhaps articulate how they differ from each other.  If you find Product C far superiors to Products A and B, say so and explain why.  If you find Product D far inferior, say so and explain why.

If they can get a critical mass of reviews, they could even match up users with similar skin types or other similar makeup needs.  For example, if several people have the same favourite masacara and the same favourite eyeliner, it might be helpful to know what each other's favourite eyeshadow is.  Or, if a product gets discontinued, you could find out what other people who liked that discontinued product also like and dislike, and avoid some irritating trial and error.

So how do we get all these people to write all these comprehensive and detailed reviews? My idea is: what if this website was sponsored by a retailer that sells a wide range of brands of cosmetics, like Shoppers Drug Mart or even Amazon?  Users could earn points for writing reviews, and the points could be redeemable for free cosmetics at that retailer.  To encourage users to populate the site quickly, the first X reviews (where X is the number of reviews they need to make the site useful) can get exponentially more points.  They could also have easy one-click links on the review site to buy reviewed cosmetics from the retailer.