No matter where it appears, an illustration always attracts reader's attention. It is appropriate on magazine pages, booklets, posters, websites etc. Most people (and web readers in particular) don't read, they scan instead. A picture placed between paragraphs of text is an excellent solution to emphasize surrounding content.
Vector illustration is a step beyond traditional raster graphics: a single vector image can be resampled to billboard size and converted to desktop icon without any quality loss. You pay for one, but get as many as you need!
Need a comix character for advertising campaign? It will take us less than 3 days to create initial sketches.