Yes, I do too. If it or they really speak to me, I buy them, hoping to be hit by inspiration for a setting at a later date. Meanwhile, I'm just happy to admire them as loose stones.
I do. If a really good matched pair come along, I find it hard to pass it up, even if I don't know what I'm going to put in the middle of them. I still have some matched pairs around that I have to eventually set.
Yes, I have a few pairs still unset with no thoughts as to what to set them with at the moment. I've had my pair of cushion red spinels unset for more than 10 years until I finally set it with my AVC. I buy them if the colour and price is right.
I buy matched pairs more for the prospect of eventually making earrings with them, but one never knows. I have yet to venture into the world of diamond pairs for sides like traps or half moons.