I'm sure there are scammers out there who are really deaf. However, in these cases where a person claims he/she is deaf and is offering you money in exchange for more money... those scammers are likely to be hearing acting as deaf.
What I don't understand is how these people can easily fall for those scams. Seriously, it's so easy to see it and realize that it's a scam. When it comes to writing a check, anyone can do it... why me? Seriously, $1,000 just to take your check and write you another check? That's practically the oldest trick in the book.
Here's an OLD bar trick. You show up at a bar and see a man standing quarters up on their ends. You offer him a dime for every quarter he stands up. He accepts. After standing up 10 quarters, you take all 10 quarters and give him $1. Technically, you offered to pay him for his money... 10 cents for each quarter that were standing up.