I'd rephrase that into skimmers are often driven away by a block of text while readers are driven away by page-filling images. There is an optimum between these

I'd rephrase that into skimmers are often driven away by a block of text while readers are driven away by page-filling images. There is an optimum between these two which attracts people from both sides of the divide - a few targeted images can enhance a text and make it look less imposing to skimmers.