Limit Orders At Bid For Long Position

I would like to hear if anyone has personal experience in trading placing long postions with limit orders at the bid price during monday thru friday trading only and “not” during the major news releases, and am referring to ECN brokers that do not have fixed spreads and do not make there money off the spreads but thru there commission. Also what that experience showed you about this type of long limit order at the bid price…

                                                                                   Steve