Personally, while I wouldn't mind donating to a campaign to get a snake as a companion or therapy animal, I don't think I would be comfortable donating to someone who wants to buy a breeding animal. That's just my personal opinion. I don't think you're intrinsically in the wrong for attempting to crowdfund a snake for a breeding project, the platform can be used for anything you want, but I wouldn't want to put money into a goal intended to eventually make someone else money. Now, if you were offering a first pick of the hatchlings or a discount on offspring to your hypothetical funders, that would be different, that would be paying in for a potential future return and wouldn't sit weird with me. But asking for money for a snake that you're capable of affording on your own just because you want to have it sooner... yeah, that strikes me as a little selfish.
That said, I also think asking people to crowdfund vacations/trips/other non-necessities is also kind of selfish. I wouldn't donate to those campaigns either. But is it still a legitimate use of the crowdfunding platform? Sure. Is your hypothetical snake campaign a valid use too? Sure. Just because I think it's selfish and wouldn't donate doesn't mean you're in the wrong for wanting to give it a try (hypothetically).