I've not been faced with selling some of my males yet. However, if my lesser gives me a pastel lesser son, he will probably replace his dad. Jax, my lesser, is a house favorite and we're all attached to him so I know it will be hard. I definitely don't envy your position.
I have, however, had to sell a female spider that I had raised up from a hatchling. When I traded her, she was only 725g or so but I just had to keep in mind that she was being replaced by a bumblebee and that I was doing this for a business. I traded her to someone on the forums and that helped me to realize that she would be in good hands and make lots of pretty babies one day.
I've been on the receiving end as well. I got my lesser male and my big normal from a local breeder. She was VERY attached to the normal (Tabitha). She had raised Tabitha since birth and so, when I purchased her, I kept her name and sent the breeder periodic updates. Now that Tabitha is day 32 POS and I'm eagerly awaiting her first clutch, and mine, I keep the breeder informed and it works out well for us.