TK - they will chase. I've only fished the Snohomish a few times, but i've had a few chase. Most just like to jump and tease you.
I can also say that up on the snoqualmie and the sky I catch many each year that slam my lure, and many of those follow all the way up to my feet before smashing it. If you are really convinced that silvers won't chase and strike on the Sno\Sky - come with me some time. you will be a believer \:\)

HH - you may have a point (not a great one, but at least a valid one) if these guys were flossing just for food - as in catch 2 and go home. Instead, it looks like some guys floss just to C&R as many as they can to have some big numbers to brag about. Flossing and snagging is nothing to brag about.... If a guys feels he needs to stoop to desperate measures to feed his family - well I'll leave that up to the judge, but flossers and snaggers who do it just for sport are a sad lot in my opinion...

PS - I have no idea if anyone in this thread is a flosser\snagger or not. I'm talking hypothetical and from my personal experience and observations...