I don't get it. If somebody wants to buy 10 or 20 contracts of the emini ES then why should they scale in instead of just buy the 10 contracts? People say because you don't want other traders to see what you are buying or shorting. But I don't see why it would make a difference if they see that we just bought 20 contracts. If they see we just bought 10 or 20 contracts then they might buy also and that will force the index higher and that is what we want for it it to go higher so we can sell. Why not just buy them all at once? Why scale in only 10 or 20 contracts?