Doing the math it would require to find that average would require ... too much math for me to answer. There are too many variables. The PGA tracks
Sand Save Percentages. In the top ten you'll find one guy who has only played 38 rounds, another with 78 rounds played, and they're ranked 9th and 10th.
Coincidentally, Bud Cauley leads the PGA. 65 rounds, 109 bunkers, 69 saves, 66.99%.
Whether consciously or not you're going back to what I said in my original post mentioning the one advantage is they aren't using the bunkers as a landing area.
"Worse case scenario, I'm in the trap." Hell, I think that. I've seen it happen a lot.
Here's where you're missing the point. The sand they were playing out of this past weekend is not like the sand you normally play from. It's hard to call it "sand."
From Poulter:
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The guy who won the tournament said it was the most challenging sand he's ever dealt with in golf. JT was four of seven in sand saves for the tournament. The PGA Tour pointed to a third of the sand save possibilities in round one were converted. The tour average is a little south of 60%.
You mention playing in this area. The first time I saw that type of bunker was at a Holiday Inn Resorts training center whose course was also open to the public: north Mississippi. I do see it here, but it's course specific with the true links courses being the main culprits. (I will forever avoid the bunkers on the left, #10 Stone Ferry, because of what it did to the face(s) of two of my wedges. I lay up now...on a four par.)