Designing a new site to be accessible should not add significantly
to development cost.
Some aspects of accessibility, such as use of style sheets, can actually
reduce the costs of maintaining or updating sites.
For existing sites, the ease or difficulty of making sites accessible
depends on a variety of factors, including the size of a site, the complexity
of a site, and the authoring tool that was used to make a site. Periodic
upgrades or reviews of sites can be good opportunities to review the
accessibility of sites.
When compared with the broader audience that a site is available to,
and the greater usability for other users as well, accessible sites
can be cost-effective.