I've had that, it often happens. But now I'm getting people cancelling then leaving negative feedback. Wasn't sure if it was a common thing or if it's another trader getting upset and trying to push me out.
Do you have good ratings on there? If so, that could be it.
Skrill and LR will work because you won't be able to do chargeback. However, it will come to the point that which party should deliver first. Scammer could easily pretend to sell btc and receive skrill or lr, then just disappear without delivering.