For the 7 acre food plot I have one question. Say one guy out there puts out a bag of corn on the ground, one bag three days before he hunts. Another guy planted an acre of corn on his property. Both these hunters kill a doe, one eating on corn that was thrown on the ground, and the other deer was eating corn in the one acre plot. Both deer were eating corn that wouldn't naturally be there and both hunters used the corn to harvest the deer.
If you have your bait spread out over the same amount of acres as a plot, then there is not a difference, if you don't, the difference is astronomical.