There are two main reasons for this sort of AU (apart from my liking AUs a lot).
1. RONON HAS A SWORD (evidence as below - okay, I know his name starts with a C for some of these, but just imagine the beard and dreads)
2. THE WRAITH HAVE SWORDS (and they're kind of like Elves gone to the dark side, right? This theory is illustrated below using Elves and Wraith!)
stargate_vegas_wraith_spike - by wraithworshipper
Jimmy - by taenadoman
Todd - promo pic by Ariane
I mean, the Wraith are kind of embarrassingly OTT and gothic, so why not use that instead of shying away from it? Plus it's a load of fun and Ronon gets to be (even more) awesome. \o/ \o/