Talking about the value of Web standards from four aspects

Clearly understand the value of Web standards! The value of Web standards believe that no one will know, ignore. But what can be done, can be very good as a standard or indicators to diagnose the problem of the site, can you list a list, clearly see its value?

I have a list of values that I would like to make, and I hope to improve the idea and get a better opinion. How to get the detailed inventory data is still groping.

People--Visitor:

Speed of access (how to speed up, how much, bytes reduced, lower concurrency)

A variety of devices available (multiple browsers, multiple versions of browsers, multiple devices)

Multiple styles to choose from (skin-changing technology)

People with disabilities are not denied (WAI)

Facing people--developers:

Development speed (single version development, without independent development for other devices)

Maintenance complexity (after separation, structure reusable, style reusable, pictures and CSS can be independently maintained)

For people--operators:

Server costs

Cost of bandwidth

Cost of development (multi-version development)

The cost of SEO (better for search engines)

Machine-oriented-server load:

Bandwidth Savings

Search Engine Friendly

Web Data Mining (semantic network, micro-format, XSL extraction data, etc.)

The value mind map of Web standards: