I don’t use the easyboots, but I do use Renegades. I get about 600-800 miles out of a pair (one season), then they become backups. I have boots from 3 years ago that I can still use, probably 1200 miles on them! But Renegades are a bit different, with more replaceable parts. I’d say after my initial investment I replace the 2 different straps (replacement cost $8) about 4 times over the life of the boot, and sometimes a cable. But every horse is different, and some destroy some parts/boots more than others! And some might depend on your terrain too. I have lots of rocks, not much sand, I bet sand would eat boots faster.
I trim every 4 weeks. Often I touch up myself and can go longer. Friends who do more casual riding (trail riding a couple times a week, not endurance conditioning) have used their boots for a couple seasons (renegades, easy boot glove, backcountry, etc).
I know on any of the boots the initial price seems a bit high, but I think I save money in the long run versus shoes.