The diesel when split between 2 was a bit cheaper than flights (150-160L each way). It's nice to have your own car & to be able to take my grill & Esky with me. Not a fan of being trapped in a flying tin can & abiding by their rules.
The largest cost is the time consumed with driving. I think 8-10hrs is acceptable but 16hrs is too long for a single destination that doesn't require a vehicle. Apparently there's only so much Bitcoin to discuss in a single sitting with 1 Bitcoiner & 8-10hrs just about covers this.