the whole point of crossing certain breeds over a greyhound is to dilute the amount of running blood but gain in other aspects such as tractability sagasity and trainabilty to name just a few, there are certain jobs that a pure greyhound just is not cut out for, it is far easyer to go and buy a pure greyhound than it is to produce a lurcher if they were the better dog for hunting you would not have people spending many long years producing certain types of lurcher, greyhounds are point and chase dogs and are better suited to the track which they excell at.