[quote=Magic Magnum]
Just a way to make it show, mainly because people like to skim through posts and it can help people catch what's actively happening at least.I personally just used it to be eye pleasing though, once in a while my eyes would hurt just going through text that was all the exact same. The bold gave something a bit different that sort of stopped the blur/annoyance going on with them gave my eyes a chance to reset.
[/quote]

Oh, I suppose that's a good reason. 

[quote=Magic Magnum]
The different colours case is only done by people for other characters (and I ever did it, it was a test run and I scrapped it quickly), but I find it's normally only used when people generally don't bother details who says what. So instead of say: Ryan ran down the hill and said "I'm going to the supermarket", and Hordor replied "Hordor".
[/quote]

I think this less so, haha, because it just goes back to writing ability. Even without color coordination, you should be able who's speaking based on the writing. So, taking what you said, I would know it wasn't Ryan speaking again since you started a new set of quotes for him. Plus you'd ideally start a new paragraph because it's a new speaker.