Such varieties don't cost any more than susceptible ones. Ohio soybean producers lose 6 to 12 bushels per acre each year due to disease, most of which cannot be seen because it is in the root systems and stems. Varieties not entered are usually poorer performers than those entered. Selecting a variety that was in that test and had a yield greater than the test average gets you in the top 25 percent of all varieties available. Reduce the seeding rate for normal varieties from 200,000 to 170,000 and use seed treatments to produce an adequate stand that is healthy, and thus reduce cost more than yield.
Seed treatment pays.
High seeding rates were used to control weeds, but are not needed for yield. Reducing the seeding rate of RR varieties to 100,000 to 125,000 can reduce the seed cost by half, while having very little effect on yield. A few more ounces of Roundup Ultra may be needed for weed control, but you'll be many dollars ahead. Be sure to treat the seed with fungicide. Timing of herbicide application is critical.