maybes me think of ebay at first, ebyz, if it was ebiz.com that would be worth more I think, 4 letters with random meanings are worth reg fee right now though.
However, lucky for you a big company uses those acronyms and hasn't taken the name
EBYZ Inc., they are officially incorporated also, because of that I bet you could steal a good $5000 from them, normally I'd say reg fee, but lucky for you this might be worth mid XXXX to high XXXX if you sell to them, I'll buy it from you if you don't want to do the work =).
You´re right Jym, EBYZ is not in the uspto database.
I´ll park the domain, I´m just curious to see how much traffic I get with this one. Then I´ll decide if I develop it or try to sell it to that company.