My dad got a hooker dollar before. xD
Was it still wet?
On topic, though, this would be a "meh" way to advertise. So, think of it this way:
Out of the, lets say, 1000 people that have that dollar in the next month, 75% of them will take note of the website written on the bill. The other 25% wont care. Then, maybe 20-40% of that 75% will actually go to the website. The other 60-80% will either want to but be too busy, or just not want to at all. Then, after discovering LG, maybe 5-10% of that 20-40% will actually stay on the forum, because they find it relevant to their interests.
So when you think about it, out of 1000 people and an entire month, we might get one new member, if that.
It would be an interesting thing to do if you had a sharpie and some spare time, but we shouldn't rely on it as an advertising technique. Remember this too: If government officials get their hands on those dollar bills, Artificial will most likely be contacted and be told to either stop the defacement of money by the members of LG, or have his website shut down by the government.