If using steroids is cheating, then how come everybody who used steroids didn't end up as good as Mark McGwire?
History: In 2003, MLB hired Quest Diagnostics of Teterboro, N.J., to analyze more than 1,400 urine
samples from players that season. Comprehensive Drug Testing of
Long Beach, Calif., coordinated the collection of specimens and
compiled the data. This survey was agreed to by the Player's Union under the condition that the results would be confidential.
In 2004, The Federal Government seized the records of the labs in it's investigation of 11 MLB players implicated in Fed's investigation of the Bay Area Laboratory Co-operative (BALCO). Also seized were the records of over 100 other plyers not listed on the Search Warrant, of which Alex Rodriguez, and now McGwire have admitted to being on.
In 2007, The Mitchel Report, a 20-month long investigation into the use of performance enhancing drugs was released and 89 players were implicated.
Not everybody on these lists are or were superstars.