.....you back a loser OR when you miss out on backing a winner?

Today, (as I mentioned in another thread), I managed to miss out on a $71 winner that I definitely should have backed. For Valour (SR6-13) was on my blackbook list of horses to follow and Racenet emailed me telling me it was running, so there was no excuse for me not backing it. But when I saw the huge odds just prior to the race, I didn't think "you beauty, here's a chance for a big win". Instead I thought "well that one's obviously got no chance" and left it out. How dumb is that? I went against all the principles you should use of looking for value and ignoring what others think.

Anyway, what do you guys think? Do you feel worse when you back a loser or when you miss out on backing a winner? I have to say I felt pretty sick this afternoon when For Valour crossed the line, even though I was in profit at that stage and did end up making a profit for the day.