Selling kittens

I breed MC and MC mixes I know there are tons of scammers out there and I'm having a hard time selling my full MCs. I don't typically have a problem with any of my mix litters just my full litter. My question is...Is this because of the scammers out there? Is it because the price? Obviously I charge less for my mix based on what % of MC they are but I feel like when people reach out about one of my full MCs when I tell them the price it's always the same oh I don't have that much. I feel like anyone that is interested in a specific breed would have done research (I did) and know that they are gonna cost more. It's just so hard when there are people out there saying they have full breeds for only like $400. I've tried explaining like that's not even gonna cover the cause of all the tests that a MC needs done...or I get I've been scammed out of thousands by several different people! I'm just thinking to myself how could you not have learned by now? Why did it take several times for you to understand? Like it really don't make sense to me. Then it's like oh I found one cheaper and then it's I got scammed again! Like ARE YOU SERIOUS! I'm already charging less than I paid for my male and female. I've been considering keeping my full females and getting another male but I don't want our current male to start having issues with spraying plus keeping him off his daughter's when the time comes seems like more hassle then it's worth especially since I'm having trouble all ready with this litter. Like at the end of last year I had a total of 17 kittens between my 4 females all I repeat ALL have gone except my full litter