I am trying to convince my DH that we should get annual passes. How many Western Canadians have them? Do you really get your money out of them with the flight prices from here? We will probably always stay off site for our own reasons, so would it still be worth it? Not to leave the Central and East coast Canadians out, but alot of people from the East are able to jump across the border and get some great flight prices. I just need some really good convincing ideas to throw at my DH ....

and I know alot of you have wonderful ideas
I am a numbers guy, so here is the analysis I would go through to determine whether AP's work or not. My DW and I do have AP's (we got the DVC discount but we would have got them anyway.
The cost of an AP is $477 including tax. The point to buy an annual pass, staying offsite in a SINGLE is 11 days at the major parks. A 10 day MYW Park Hopper ticket is $287.55, plus $110 in parking for a total of $397.55. To get a 1 day NON park hopper ticket for an 11th day would be 75.62, plus $11 parking for a total of $484.17, more than the cost of an annual pass.
The point to buy an annual pass on TWO trips within the same year is 8 total days on all trips. An 8-day non-expiring Park Hopper ticket will cost $421.74, plus $88 in parking for a total of $509.74, which is more than an AP.
The bottom line is that two trips in a year is almost always worth an AP, but a single trip has to be fairly long.
Now your original post asked about whether it is economical with flights from Western Canada. We're from Edmonton, and have been able to get what we think are good flights for various times throughout the year. For our trip in May, Northwest had flights for $418/pp including tax. Our trip in August, United had flights for $377/pp including tax. Our trip next January is currently sitting at $486/pp including tax, so we'll wait for now and if it gets better.
I think it depends in large measure to how flexible you are with when you go, and what you consider an acceptable price point for flights. By staying offsite, you will likely have more options for cheaper accomodations if you get a good deal on a flight and can leave on shorter notice (say 2-3 months).
I would also recommend that you consider the idea from a PP of going one year and then going back the next year a couple of weeks early. That way it seems like a yearly trip but allows you to get an AP for a much better deal. The single biggest advantage of this IMO is that you will tour the parks at a much more relaxed pace knowing that you are coming back in the year and that your price for tickets is fixed. You don't have to get as much done this year, so that you can buy a cheaper ticket next year.
Anyway, I'll shut up now, because I think this is probably my longest post ever.