That is a bit high my level 12 team is at 135% & i´ve spent a good few green packs.
Last season I had three 9* players & they are expensive in packs to keep that way & I farm a lot. I would think this guy has just spent a good few bob on his team (Italian ? check he don´t have a Russian or Vietnam name? )
The probable reason why you can´t make an offer on his player is that said player is too high quality ?