Yea but you get what you pay for. You paid $100 more for the animal, but you also got it from a trusted breeder, who you can trust took good care of it before it came to you. You paid more, but I can almost guarantee that you got a healthier snake. Plus you know for sure what genes that snake is. You can ask them about the breeding pair it came from, you can verify FOR SURE what genes you're working with with that snake, etc etc. A pet store snake is just whatever they were told it is, or what they think it is. You can't ask them for breeding records like you can a good breeder.
You gotta stop thinking so negative about this stuff. You got a healthy snake, it's eating, and you found a great herp community to get advice from. You're doing fine bud, don't get hung up on "should have, would have, could have" stuff.