Eonwind,
The easiest way I can explain why I role play fights instead of PVPing them is to show you an example of a good RP fight. Read this then ask yourself, "Could this even come close to happening via PVP?" The answer is no. When you PVP, you duel, then its pretty much over. Kinda boring if you ask me. I've tried mixing RP and PVP but I find it very dissatisfying every time, so I don't try to incorporate PVP with RP at all.
Of course nothing like that can be done with a simple PvP duel, and I knew that before. I understand your point and why you guys have so much fun RP duels.
About me I experienced just one RP duel and just one PvP duel (my current roleplays don't involve so much fights and my chars are not eager to start a fight after all), so my experience is very limited on this topic, but I had more fun with the latter than the RPed one. I hope you don't blame me for that

PS1: Jonoth and Vayl played a very nice piece of storytelling, my compliments to them

PS2: I just want to point that the player I roleplayed the duel with was very fair and a good roleplayer so there's nothing wrong with him