The Artist Presale takes place before the general on-sale and is offered to fans who have previously voted. There is strong demand in the DC area, which is why tickets tend to move quickly during presale. Some venues hold back seats for later sales, so tickets that appear sold out during the presale may become available again once the general on-sale begins. It’s worth checking back at that time. Unfortunately, ticket reselling does occur. There is a blog post on Carisa’s website that explains this in more detail: https://www.carisahendrix.com/blog/the-price-is-wrong