Ignore estibot - it is never accurate - at least not anymore than a broken clock that is correct twice a day :P.
I don't see a lot of value in this. It is a bit of obscure dictionary word - for someone who overworks (even Google thinks it is a typo and tries correcting it to "overworked")... But not really a term you see used and I don't see much commercial value. Doesn't work as a keyword domain. It probably works best as a blog site, but then there is not a lot of value in those even with this being a sort of "dictionary word"..
My thoughts:
reseller = regfee - low/mid $xx
enduser = mid $xx - low $xxx
Hope this helps!