To be honest, I can't tell you for sure what is responsible for this beauty tool's magic, but once dampened, the Beautyblender doubles in size and turns into an incredible makeup applying machine. I suppose you could use the Beautyblender dry, but I like how a wet sponge thins out my Colorstay foundation and creates a sheer, but still long-lasting, base.
So, sure, the Beautyblender may seem like an extravagant purchase. I agree that $20 is a lot to shell out for a makeup sponge, but if you only need to repurchase every few months, then I think it's well worth it. I purchased mine at Sephora, but you can find the Beautyblender at a slew of other beauty retailers. Go out and get one. You won't be disappointed!
Have you tried the Beautyblender yet? What's your favorite makeup application tool?