From my own observations,the main reason nags firm dramaticaly on the tote is when some goose from a radio station or sky say that it is being crunched on course,then all the sheep follow on the tote.Most of the sheep are in pubs and clubs and full of turps which is a real sensible way to bet??????? Midweek a lot of these courses where a nag is crunched there is only 2 or 3 bookies and 2 or 3 hundred bet will crunch a nag.Finally if you look at real stats only about 20% of these crunchers win,then of course the announcer says see the money is always right.The majority of my winners are horses that blow in the market.In fact I have based a system around blowers which is quite succesfull thank you.