What you're suggesting, I think, is that it's not related to prejudice or an effort to "get" Opera, but rather is because site developers are trying to limit maintenance costs for sites they develop. It's easier to just set up the site for a limited number of browsers. And I guess that's where having a leading market share helps. I was naive š and thought there were simply coding (html or whatever now) standards, and that what was necessary was for the site to meet them, and for the browser to do so also. I guess that's just the ideal world. On the other hand we are talking about Yahoo Answers not working with Opera. Yahoo is a major player. So are we to take it then that Yahoo is just trying to save costs in maintenance? Perhaps they can get away with this with browsers with a smaller market share. If they did it to Firefox, there would be more of a fury to pay from their users.
Its not the developers. Its the business group. They allocate money for projects. I worked for Chase bank, home banking, and many of us personally used Opera. But we were directed not to QA test with the Opera browser due to its low user base. Lately, using Opera 20, I've been getting the following:
Your browser may not give you the best experience when you're on Chase.com.
We recommend that you use any of the following browsers: Internet Explorer 8 or higher, Firefox 14 or higher, Safari 5.0 or higher, and Chrome 26 or higher.
https://chaseonline.chase.com/Logon.aspx?fromLoc=ALL&LOB=COLLogon