you want to know how important it is to grease the threads of pedals?
well, I have this trainer, and I thank the mechanic who put grease on the pedal threads because after 6mo of sitting outside in the rain, the pedals came off with minimal effort.
If my bike ever sits outside in the rain for 6 months I need my ass kicked.
That being said, I can't garuntee that my pedals won't ever get wet so I will stop and get some grease on the way home.