Have Price on BF become irrelevent?

Interested in the views of the more experienced US racing Punters on here. It used to be that a big Exchange drifter (e.g 7/5 on the US tote and 3.75 on BF) would 9/10 fail to win. These days the market on BF seems an extremely poor indicator. Often times big BF drifters winning easily or massive plunges finishing out of the frame. Its not something I traditionally used as a defined strategy to my punting but I must admit that it is something i kept an eye on. In the last few months it has caused me issues as I've been put off my fancies based on the market moves. The only sensible reason for the change in this I can think of is that the more informed US racing punters have given BF a bobyswerve because of The Premium charge and as such the market is no longer made up by informed bettors. I'd value any sensible input on this matter. I'm tending to ignore the amrket as much as i can when betting these days but it's easier said than done.