Question about pokerstars rake structure

[hemstock]

Here http://www.pokerstars.com/rake.html it says that the rake remains the same between .25/.50 till 1/2. At .25/.50 I had only 145 raked hands over .50c out of over 18k hands! I was planning on clearing the bonus at .5/1 but if the rake is the same, it seems it might take forever.