I can offer several reasons. The Golden Rule . Do unto others as you would have them do unto you.
Nobody likes being marooned on a lame website.
If you can't provide all the answers yourself, you should at least offer links to sites that can. Serving Your Clients . Whatever you do to make your site more accessible to strangers will also make it more accessible to your intended audience. Pride in a Job Well Done . Whatever is worth saying, is worth saying well.