I've worked with companies with terrible websites in the past, either to give them a new website or to fix existing components while keeping my eyes closed... I think there are a few reasons here. However, your actual question? No idea, I would love to see some stats, but I doubt it can be quantified that well (see point 3).<p>1. Someone in the executives actually likes the site the way it is. These are business people, not designers. I'm surprised time and again, how if you give a business person a logo drawn in crayon, they'll chose it, because it show synergy or whatever (slight exaggeration). Maybe a family member made the existing website for them. Even if they recognize there are other websites out there that look better, they cannot imagine that website with their logo and content. One company I worked with saw our wireframe and love it. It was so much better than what they had, even unfinished, and because it had their logo in the top corner, they were able to get it.<p>2. Costs are unknown. How much does it cost to make a new website for me? This guy says $500, this guy says $5000, what is the difference? These people are in the top of other fields. They know if their electrical contractor pushes them for 2 months and doubles the price whether its reasonable or not. They have no idea for web stuff.<p>3. Success cannot be easily quantified. Was the uptick in business as a result of a new design or the full marketing campaign you launched at the same time? (and I anticipate functionality far outweighs design, I mean, look at DrudgeReport, still extremely popular with a very basic design) And certainly depends industry to industry. A good design means far more to a web design company than it does to a electrical contractor.<p>(edit, added a little spacing)