Hi, Fazzer. I'm not a Video Poker expert.
Was connected to an excellent VP player. Guy churned significant VP profits over time.
A few basic ideas:
1) FPDW was the best VP game. In chat I asked Advantage Play wizard James Grosjean: "Will casinos remove the >100% Return games (specifically FPDW)?"
...James answered "Yes." And this was years ago.
...Casinos don't like giving away value. Especially when fish will donate to any payout table.
2) If you break down a casino floor to Profit per Square Foot, I'm sure the Slots grade out highest. People play em, and they don't care about the odds.
3) To your original point, Yes. The Royal is a huge % of the Gross payout but it hits infrequently. So, low Frequency but high value went it lands.
...On FPDW, Royal paid out 800 units on a 1-unit bet.