Those trips may push the reserve coverage from blue to black, thereby denying pilots in your BES the opportunity for drops, swaps or moving X days. It could create another flying obligation for a reserve pilot who otherwise would have been home. Since this practice is typically promoted by/for junior pilots in BES too junior to hold (desirable) BES the trips being dropped are the junior trips, not the good trips. You aren't helping pilots improve their schedules, you are dumping crap trips onto reserve pilots.

The one point we can all agree on is that an OOBWS reduces the aggregate value of the PWA by flying for lower wages.