Pretty sure there are other things that can impact one's rakeback too.
True, here is the list of -rakeback things from rakebackpros.
Bonus: Any portion of a Full Tilt
poker bonus, such as a deposit bonus
Player Added: If you play in a guarantee tournament that doesn't meet the guarantee based on the number of participants,
full tilt poker covers the remaining cost and divides the amount of overlay by the number of participants in the tournament
Fees: Full Tilt Poker shares the cost incurred by some payment processors for depositing or withdrawing on the site with its Affiliates; while players aren’t charged for these fees, they are deducted from net revenue
Fraud: Charge backs from credit cards are deducted from net revenue
Used Points: Every time Full Tilt Points are used in the Full Tilt Store or as tournament buy-ins, $0.005 per point is deducted from net revenue
Iron man: While Full Tilt Poker doesn’t make deductions for most Iron Man store purchases, if a player purchases and earns a bonus, purchases Full Tilt Points or tournament tokens and uses them, the standard deductions apply