Name the sprinter putting in 12-14 runs a week. If you can name ONE, that will be the one taking more roids the Ben and Regina. They CAN'T, because the load on the nervous system is too high.
There is an article on Maurice Greene in the August issue of Muscle and Fitness. Read it. HSI actually has 4-5 running sessions a week, with many weeks of M-T-Th-F and weekends off. Ben on steroids had 3 hard sessions and 3 easier sessions a week--and according to Charlie Francis' books, his average high intensity volume in his best year was 1500 METERS per week ON STEROIDS. If you add in the weight sessions (which tears sprinters down more than the track), there will be 7-10 TRAINING sessions a week for the top people.
The high intensity volume that average sprinters can tolerate is around 300 METERS per session. For 10.2 and faster, it is more like double that. Ato Boldon's logs show sessions like 300m of speed AND 600m of special endurance, but nobody is really doing more than 1000m of speed in one session unless they want to get slower. The Clyde Hart guys in the 400 only are doing maybe 10-15 mpw in season at slower pace than Mo and Asafa.
Get your facts straight before drawing conclusions. World class sprinters have many fewer running sessions than world class distance runners although the number of HARD running sessions might be about the same.