you have to try and think about how water is always in soil..moves through soil..underground.Try all the water diverting tactics ya like..raise the grade & slope,tar-epoxy along driveway,mud-jack concrete slabs,french drains and on & on...but I`m sorry,you are not going to prevent water/moisture/dampness(mold-efflorescence,insects) from entering a basement wall through cracks forever.Yes,1 or 2 outta every 10 of you might get lucky and divert enough water long enough to sell your house.What you are doing is trying to divert "surface"(ground level to 3' deep)water away from the problem(most walls & the cracks in a wall are 6-10'deep)...most of the time the problems are direct openings on the outside of your home.You really should be doing the right thing for yourself and the new homeowner and have these cracks sealed correctly..but not many seem to.Why should a new homeowner have to eventually pay to have these pre-existing problems corrected? How would you feel if YOU were buying the house?