I have ordered several of your oils and they seem fine. However, I still struggle with wondering how the quality compares to doTerra. It's very important to me right now to have the best Frankincense possible for an issue I have. DoTerra's is $70 plus shipping. Yours is $7 or $13 with free shipping. We know they are an overpriced product in general but how can there be that big of a difference while maintaining the quality?