Bigger corporations have a bigger bureacracy to content with. Too often I find coporations feel obligated to throw everything including the cybersink into the site. Now it may be interesting, but the laws of physics and the limitations of human attentnion span will make it difficult to plod through too much information at once.
Surfers get board and never get to look at the top-grade stuff.
Home-brewers are polishing individual diamonds. Bigger budget boys are digging more and more tunnels in the mines. Home-brewers are hungrier to succeed. It's not their job to do a web site, it's their passion. They're often closer to the needs of their customers and have a hands-on understanding of their products.