Re: clearly you don't pay for the developers
@Michael “I want to run on a selection of browsers that run on my developer machine and verify that it works. I can automate testing easily and quickly.”
Oh, how I wish testing was only done on the developer’s machine. No longer will I and my fellow developers utter the cry to testers ‘’well it works on my machine’. ;)
But seriously you can’t just test on your machine, you can’t just assume that it works on other platforms even if it is a browser/web app.
Let’s assume your dev machine is windows using the latest release of Firefox as an example. Just because your app passed all your tests on your machine for Firefox. Does not mean it will for Firefox on Android, Mac or Linux.
Maybe Firefox’s release point is different maybe in front or behind your dev machine. Even if they are the same it is still a different build of the browser. There is no guarantee that just because it works on yours, it will pass all the tests on those other platforms.