There are many advantages out there, most of which can be attributed to socioeconomic status. Better facilities, equipment, camps, and coaches (due to pay, history of success, demographics) lead to both higher chances for success and potentially more move-ins who weigh in athletic achievement before moving. Couple that with the proximity to bigger cities with more employment options and you start to multiply those advantages, especially the smaller the school district is.
Don't get me wrong, you have to work hard to achieve success. Privilege, like athleticism, can be wasted and underutilized. But just like athleticism, your baseline is raised the more you have it.
And as an aside, I think there should be a ban on some of the unnecessary equipment that is currently allowed but utilized mostly by wealthier schools to the disadvantage of other schools. This includes sideline replay capabilities and ball dryers. If both teams have them, fine use them. If one doesn't, can't use it. This isn't college or the NFL where all teams have the capability to have these tools at their disposal. Heck, even the NFL doesn't allow replay on the sidelines.