So you give up a unit on every flush, and in some casinos get back 10 units on the 4 royals. 40-30-6-4-1 is pretty much gone that pay table paid back about the same as Play/Ante.
The fun of 3 Card is actually the huge possible variance you get when you play the Pairs Plus. Also, do you think 3 Card Poker is worth playing at all? I have played it once and won a small amount (I never play the 'Pairs Plus'-the house edge just seems to big to me) and played another time and lost.