I would (and nearly have) paid $190 for a pair of jeans, but certainly not slacks, but only if the jeans were made in the US from specific fabric (selvage denim) that will last 5 years of 3-5x a week wear while literally never getting washed. But that's just me and other denim aficionados. That said it's no more expensive than having 4 pairs of $50 jeans you wear (and wear out) over the course of 5 years.
Anyhow, in topic.... Those Bluffworks pants look pretty interesting. Considering I searched high and low for a tailored looking outdoor pant and one without the adornment of tons of pockets, it seems pretty feasible. I wonder how heavy they are, and if they soak up water and get even heavier....