If you don't cross the book (ie offer more than the lowest bid or vice versa) the you _become_ a market maker (though not much of one). You don't pay anyone to

If you don't cross the book (ie offer more than the lowest bid or vice versa) the you _become_ a market maker (though not much of one). You don't pay anyone to do this. But because of the HFT/Market Makers you get the benefit of dramatically lower trading fees. So you don't pay for it in that case, but you still get a benefit.