As others have said, if you have a quality product, stand your ground on what you price them. The clientele who will appreciate quality, will have the $ to buy them and likely pass the word on to other people who are truly looking for quality poultry. If someone doesn't have the money to purchase your critters up front, what kind of care and quality of feed are they likely to get? Ok, I'm making a lot of assumptions and fully flying my opinion here... Unless you are way out of range on price, know your worth! I agree as others said on having a notice about no guarantees on hatching.
I used to have a small leather shop where I repaired and sold used tack and did custom work on weekends and evenings. I was making $4 to $5 dollars an hour and often heard comments about how expensive my stuff was, one person even asked me why they should pay me so much when they could go to Tractor Supply and get it for $20, yup, and they were literally there with a broken bridle from a local farm store that was low quality. I'm not doing leatherwork anymore because my time is worth way more than $5/hr. I've also had a few people give me free rein (get it, lol) to create custom pieces no matter the price because they did want custom and one of a kind.
Long story shorter, you are right, don't sell yourself short, haters gonna hate, quality is worth something to the right people.