They replenish our beach (causeway) with very soft and fine sand (think kids sandbox). I wouldn't trust anything to hold (besides buried boards) in +50mph wind when it gets water logged (regardless of angle). Even if i had a great, trusting system ... the cat parked down the beach often doesn't...
I even carry spare augers to tie down other peoples boats in summer if i am concerned they can flip on me
It is simple, winds predicted above 25-30, mast comes down. boat goes home.
Like I said, it wasn't my boat. However, by looking at those photos, it's clear to see why those anchors pull out when you have them straight in the ground. Not rocket science.
