I think that rate is not decent, up to 0.016 btc/ month to rent your avatar space? As I said previously, an avatar is more noticeable than a signature, I think 0.10 btc/per month is a good and right rate.
0.1BTC is a lot solely for an avatar, even more if it's only part of an avatar.
I agree with redsn0w.
Marco, keep in mind that a logo is the first thing that you see when you're reading someone's comment. It's not a signature, it's an image with a service or company logo...
In my opinion it's the most "distinctive" thing that we have in our profile.
