I really don't get the steroid bit- it doesn't help players see any better all it does is make them stronger than they would be otherwise.
How much of an advantage is that to a ball player facing a pitcher throwing 90+?
SO before you start putting astericks next to the names of ballplayers who you KNOW FOR SURE used performance enhancing drugs, shouldn't there be a study to see how much of a difference it really makes?
A case in point- there used to be all kinds of stories about people using "juiced bats" - putting cork in the middle to "give the bat a bit more spring" Well, mythbusters proved that the cork bat was weaker and could not hit the ball as far as a solid wood one!
For all you know, using steroids may make them stronger, but may impair them in other ways, making them LESS effective than they might otherwise be.
Steroids won't make a non-athlete into a great one. It won't turn my scrawny nephew into someone who I wouldn't worry about getting hurt playing high school football. Using them appears to make some people mentally deficient and subject to serious health problems.
Barry Bonds is the absolute poster boy to prove the steroids helps dramatically. There is a huge number of records that shows that a players performance steadily declines after the age of 32. A player at 36, will produce 25-30% less than that same player did at 28, which is the typical age of peak performance. At age 28 Bonds hit 46 HR, which was the most he hit in any one season prior to his aggressive use of steroids. At age 36, you would expect a player like Bonds to hit about 32 HR, and he hit 73, 27 more than his peak season, and 37 some the what you would have predicted.
How about Mark McGwire. At 28 he hit 42 hr. At 34 you would expect him to hit 32, about 10 less than his peak, yet at 34 he hit 70, 38 more than you would have expected.
At 28-29 Micky Mantle hit an average of 47 hr. At 35-36 he averaged 20.
At 28-29 Willie Mays hit an average of 32 hr. At 36-37 he averaged 22.
At 28-29-30 Frank Robinson hit an average of 37 hr. At 35-36-37 he averaged 26.
At 28 Harmon Killerbrew hit 49 hr, at 36 he hit 26.
If you want I can give 30 more players just like these 4. Show me any other players like Bonds, and McGwire, and in almost all cases they have been linked to or are known users of steroids.
I think it very obvious that steroids help you increase strength, which allows you to hit the ball harder and farther, and it allows you to come back from injuries faster, and allows you to recover from intense training faster.