Sooner or later, your collection is going to be exposed to some thing awful because you have no quarentine. It's irrelevant until you lose every snake you own because you can't be bothered to quarentine new arrivals.
I don't think I'd want to deal to you with how you're blaming the seller for illness you can't prove came from him, for a lump on the nose that you CHOSE to keep, after he paid the vet bills for animals he doesn't know were sick at all.
And there's always those vague "people who had the SAME result as me!" who never emerge, only contact the OP. Whatever forums are saying you're right, go cheer to them about how terrible it is that the seller paid your vet bills after you had them two full weeks and chose to keep them in the first place.