A simple/cheap way to reinforce your wood arrow tips behind the point is to put a heavy coat of 2-ton epoxy over the last three inches of shaft, including the lower part of the target point. I just smooth it on the shaft with my finger during point installation. Not exactly pretty, but it adds a bit of point weight, dries hard/strong and will stiffen the point quite well. If the tip does break just fix it with a reparrow tip and do the same thing all over again. Your mileage may vary, but I've found this trick to extend the life of my wood target arrows considerably.