John 1:30

Greek #5228 ὑπέρ. huper. Over, beyond, on the other side, across from. A spatial preposition. The figurative uses might be "for the benefit," "for the sake of," but figurative use is conjecture, speculation, and based on what one perceives the context to be. It is found in John in the genitive case which would give the meaning "across from".

The translations "for the sake of" or "extending benefit to" seem rather contrary to a genitive case and should rather have a dative case. In other places it is found taking an accusative which would give it the meaning of "beyond."