yes
no
If steroids were so prevelant that they caused an "increase in superstars", wouldn't the use of steroids almost "cancel" each other out, considering both pitchers and hitters did steroids? Is there any actual work that shows there were "more superstars" in the 90's than in other times? There may seem like there were more, for a variety of reasons. First, the media is much more prevelant nowadays, making the stars more known. Secondly, offense was up, for reasons beyond simply steroids. An increase in offense causes superficially "better" numbers. "Better" numbers like more home runs leads to a perception that there are more superstars, when in reality, there's usually always a similar number of "superstars"...at least when using "superstars" to mean "the league's best players."
I'm going to take a minute and get back to this later, because I'm bored..No, I mean that there are not as many superstars anymore as there was in the past, in the past each team had a superstar...
Superstars:
D'Backs - Brandon Webb
Braves - Chipper Jones
Orioles - Nick Markakis*
Red Sox - Manny Ramirez
White Sox - Jim Thome
Cubs - Alfonso Soriano
Reds - Ken Griffey*
Indians - C.C. Sabathia
Rockies - Matt Holliday
Tigers - Miguel Cabrera
Marlins - Hanley Ramirez
Astros - Lance Berkman
Royals - ...
Angels - Vlad Guerrero
Dodgers - Russell martin
Brewers - Prince Fielder
Twins - Joe Mauer
Yankees - Alex Rodriguez
Mets - Johan Santana
Athletics - Huston Street/Frank Thomas*
Phillies - Chase Utley
Pirates - ...
Padres - Jake Peavy
Giants - Tim Lincecum
Mariners - Ichiro Suzuki
Cardinals - Albert Pujols
Rays - Carl Crawford or B.J. Upton*
Rangers - None
Blue Jays - Roy Halladay
Nationals - Ryan Zimmerman*
There's a couple teams without any clear star/superstar, and some (marked with asterisks) that are extremely debatable. However, I'd imagine that that holds true over all of history - some teams just aren't good. There's easily over 30 superstars, when you account for multiple stars on the same team, which comes out to one per team on average, and I'd imagine that that also holds true throughout history.