Laskem, the Israeli president is not permanent. He serves a single 7-year term and is then done. He can’t be reelected, and he can’t return to politics for five years (if I recall correctly).
CTLawyer, not only is the normal profit from business conducted at arm’s length, in the open market, not an emolument, the clause doesn’t apply to the president anyway. The presidency is not an office under the United States, so the president is entitled to receive outright gifts from foreign princes, if he likes . George Washington had absolutely no qualms about doing so, made no attempt to hide it, and the Congress made no protest or attempt to stop him, or even to give him preemptive permission. That proves they saw no violation either.