Yup i agree...some time last year i decided, hey what the hell ill get some Superfeet for my snowboarding boots..if they dont work worst case ill use them in my regular shoes...
Now i love them as they give much more support to my feet allowing me to go longer. Atleast for me with my current boots(Burton Rulers) that fit well and were comfy, actually made them better by putting some Superfeet in it. The reason i found was that because its a thicker insole than the ghetto crap burton puts in, it raises my foot in the boot closer to the top. This gives me a snugger fit on my bottom zone without having to crazy tighten it down and without any lose of control or ankle movement...
For the record ive used both Superfeet Orange last year(now in my shoes) and this year i got some of their Superfeet RedHOT specifically for ski/boarding boots and they work well too. Kinda spendy, but well worth the money.
Yeah, I've heard of super feet. I'll have to check their website. The money is well worth it though. Here's aline's website if you're interested in their tech: http://www.aline.com/
And about manufacturers not putting good insoles in their boots- I can totally understand why. Each person's foot is different so they don't want to waste money because it would drive the average cost for the consumer upward, and might not provide sufficient benefit across the board to justify the added cost.
That's all fine and well, but I really think boot manufacturers should go to the trouble of alerting the consumer that a good insole is the best way to go for anyone. And as far as ski shops go - I've even been to several, and not one has ever recommended an insole while you're boot shopping unless you specifically tell them your feet bother you. So newbies to the sport have to find out the hard way, and eventually come back and ask later (or endure the pain needlessly). Preventative maintenance is the best route.