The only reason Roblox is free is because they are a big corporation and have tons of people paying for that ripoff you call Builders' Club. Blockland costs because Badspot is one person and he needs to make a living somehow, as will the rest of us in the future.
Also, it doesn't take 20 minutes to build stairs in Blockland. You must be very crappy at computer games if you can't work a loving keyboard. The demo gives you everything in the game but limits you to 150 bricks and online play, it doesn't have "barely anything."
If you were intending to say so, Blockland does not "suck" because it costs - that's like saying that the house you live in, the computer you're using, and that shiny new XBox 360 of yours all suck ass because they cost money.