i think it's actually the opposite. it's easier to get players on your server on blockland because there is not much choice. on roblox, it's extremely hard to get people on your server. there are literally hundreds of millions of places to go to, so the probability of someone joining your game when you're in it without it being on the front page on roblox is extremely low.
even when i joined roblox in march 2008, my id was in the 200,000's. roblox has had some crazy success, i still can't believe there are millions of players.
i don't understand why blockland hasn't had the same success as minecraft and roblox. it's a great game.