rakes and payouts

[wyattjames4]

does anyone have any suggestions on how much rake you should be willing to pay in relation to the buyin and payouts? right now the sit n gos i play in are 5.00 + .50. does that seem like a disproportionately high rake? i cant remember what the payouts are but its something like 21, 16 and 9 for 1,2,3.