buying into flying

Only six weeks to go. Have tried to step into the wonderful world of buying airline tickets, but it is a bit of a let down. Unless you know exactly when you're flying back. And that, my friends, is what I do NOT know. Who knows when I'll head back. Ever tried to book a one way ticket? It is not only more expensive, as you would expect. But can anyone explain to me why a one way KLM ticket to Vancouver is MORE THAN TWICE as expensive as a return ticket?

Found out about some strange but fun airlines though. Maybe I'll fly business class from London to Las Vegas for 500 euros (by www.maxjet.com) and then from Las Vegas to Vancouver for 65 euros by some unknown American charter?? Possibilities enough. We'll see.
I'm not doing that much typing today because my shoulder still feels like it has been torn off and has been hastily glued together again. Ah well, we suffer be it not in silence anymore. Advice to friends is not to make me laugh, that hurts the most.