Yes, grip comes from the tread surface moving as it is loaded up ... wear comes from the tread surfacce moving as it is loaded up.
I have always said you can tell a car that is working well as it wears it's tires equally, a car with high wear on the front is understeering, higher wear on the rear is oversteering (4wd ... 2wd should be about 2/3rds the wear as all it is doing is steering).
That said the dBoots I tried seemed to give "reasonable" grip and seemed to offer (relatively) low wear. I think you could use them as a practice / club tire quite happily for probably 20-25 runs without too much of a performance drop off. Normally find 5 to 10 runs is enough to finish a yellow mini spike.
Bolting a set of fresh yellows on would give a significant decrease in lap times though I would have thought compared to the dBoots.
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