Not quite sure what that means, but Im guessing it means they'll be less nature delivered to my tomatoes from creatures. Really, its a toss up for me financially. Either pay out for the lumber to make the raised beds, or rent/buy a tiller to prep a spot in the yard. Either should be a one time expense that lasts a long time. One benefit I see from a raised bed is that its a lot let bending over and hands and knees type work. Something to think about I guess.