Roids do not just increase muscle mass. You still have to lift. Steriods allow the body to heal faster so you can lift more frequently.
And baseball has been talking performance enhancing drugs since the 60's...so don't just blame Selig. Bottom line...the sport has gotten exactly what it deserves and so have the fans. Because they know what's going on and they still show up for the games. My guess is...it doesn't bother them.