if you're familiar with the http://www.milliondollarhomepage.com/, it's based on a similar concept but instead of having the persistent placement of your ads, each block of pixels is an NFT that can be sold as an online property. The proper analogy would be owning a billboard. Whoever owns the billboard can show whatever on that. Now, billboards can appreciate in value depending on how hot the property is. By buying a block, you're buying a space (billboard) on the wall. Since all pixel locations aren't valued the same, these NFTs aren't valued at the same price as well. Once the property becomes hot ( more and more people list on the wall ), the prices of these blocks will drive up. Until then, you list your advertisement, NFTs, or art on it and link it to your website or art, etc.