typos of common/generic/descriptive terms like "business" are ok. There is no one entity that can claim they coined the term "business" or that they have proprietary rights or demonstrable secondary meaning in the term.
typos of trademarked/coined/fanciful/proprietary terms like "pokemon" are just blatant squatting and that means that any covetous party just has to reference that to remove any element of doubt from your legit registrations as they can use it to show a pattern of bad faith registrations.
If you regged a domain purely because of the goodwill of another single entity (i.e. Nintendo's pokemon) then its not good for you or the domain market as a whole.
I really can't picture someone paying more than the registration price for a mispelled word unless it gets a ton of hits and you are using it as a pay-per-click site. That's just me though... there are probably people out there that disagree...