The way in which they provide and present information is crucial to the investor understanding value and influencing the decisions they make. The third and probably most interesting sphere is that of all companies - companies who use the web or internet as their business. If a company has customers and its primary or even secondary channel is the web, then its services better be usable and intuitive or else users and potential customers will turn away in droves to look for an alternative service that fulfils their needs and goals. If revenues are dependent on and at the fate of the terrible usability demons lurking in the lifeblood processes of their site - they will suffer and so will every investor. Like many before me, I use Amazon as an example of simplistic transactional processing which works - but you would be surprised just how many companies screw up these processes and the usability, or just plainly ignore it.
All investors seem different.
They do things differently, but they all subscribe to common processes, which we tend to overlook while providing them information of one sort or another. I am talking about finding common processes that people use without really thinking or knowing it. After spending some time researching this issue it became clear that investors want to make decisions, hence the use of financial advisors, but in the new world of investing, they are taking it upon themselves to make more money by cutting out middlemen and doing it themselves. Usability is a big part of helping them to understand and act upon information that they gather. Presenting information in an intuitive fashion and allowing them to manipulate it can effectively be supporting their decision making process.