Hullo umrum,

Yes, we have all done that.
Particularly, betting on the races run during the week. The astute punter identifies many opportunities in the more obscure venues on the provincial and country circuit, particularly on the eastern seabourne.
As another contributor, Kenchar, said in a recent post.....all it needs is patience and I agree with him that it is easier said than done. We cannot resist the allure of having one more bet on that "certainty" in the upcoming race....wherever that may be.
As you indicated though, if punters restrict their bets to "class" horses they will definitely notice an improvement in their strike-rate and eventual POT.
Cheers.