You guys are really overlooking the biggest difference(although the HBD n00b touched on it).
It's not what you don't have, it's what the others already have. You can build your team whether it's brand new or a season 10 takeover. Nothing will stop you. But, if it's a S10 takeover, you're going to have some owners who have been building their team for 9 seasons. Their BL team should be set, they should have minor leaguers on the way and they should know their strengths/weaknesses without even looking. The new guy does not have this. So he is definitely at a DISADVANTAGE.
But new worlds aren't the be all to end all. Good owners will find their way to the top, bad owners will bottom out(and probably leave a big stinky turd for the next guy) and most everyone else will be somewhere in the middle. So, after 2-3 seasons, new worlds are old worlds and those looking for a "Fresh start!" will just repeat the process.
I wish there was a way to see how 'tarded up the "WANNA START FRESH?? PASSWORD IS....." worlds are right now.