you may want to take LookUpCo.com as well which is freely avail at the moment.. can also mean "LookUp Company" ..looks better i believe
since to me LookUpCom does not look like "LookUp Company" but does look like a typo of LookUp.com traffic catcher i'd put $0 on it .. i doubt there's any considerable traffic going from lookup.com, can't also see any other reason it was previously registered and dropped on no traffic revs .. don't see any value.
lookupcom.com for social network, company info web? no chance based solely on aesthetics not even touching semantics, brandability etc.. "Anything+Com.com" looks ugly from any point.. it's awful i'm sorry
good news is you seem to still be able to grace delete it and get your money back.. which is what i'd recommend