Ya well if you became a pro bow hunter that was paid to do what you love I think your opinion of a grand slam would differ. And remember he only hunts during the season that is in and I'm pretty sure that's only a max of two times a year which is no more than the average hunter hunts.
it's a waste of life, with you hunt to feed your family it's ok, but if you hunt just for fun, just for get some animal achievements, and let the carcass rot there in the open field, it's a shame.