Do you collect pedals or operate either a loose or strict 'one in one out' system? The latter for me. I have plenty of regrets; Yamaha 1005 analogue delay, early 70s Colorsound wah/ fuzz/ swell amongst them, but generally if I decide I want to try something new or if it's not on my board, it gets sold. I have a few cheapo pedals that have little resale value that act as emergency spares, but the only pedal I will not sell under any circumstances is my 70s MXR flanger. I always try to find a place on my board, but I usually don't 'need' a flanger. It is on my shelf at the moment!