Why do we run so many bay dogs?

couple bay dogs and lead in a bull dog all you need...teach one pup at a time and then when it is going good take one veteran dog and a pup see what happens if you call em a (BAY DOG) then let em bay they should be able to hold that hog there until the bull dog gets it caught...i found that more bay dogs the more chance it breaks and then you runn the hog a while..which in the long run takes chances away from catching more hogs or flushing them hogs to other land owners which you might not be able to hunt...something to think about.. but if what you do works then do it "dont fix something that aint broke "