I know most people don't compare the commitment to snakes with the commitment to other pets like a dog. But I can't help but think....would I sell my dog because she had a sensitive tummy and could only eat expensive dog food? Nope.
To me, it's just part of the commitment I make when taking on an animal to care for. Some are a bit of a pain more than others. Some are a bit pricier than others. But it's all part of the package. I might make a concerted effort to get the picky eater switched to rats....but I would not insist on it doing so as a condition for me keeping and caring for it.
That's just me.