The block reward splits three ways: 60% equally across the committee, 25% by earned weight, and 15% by the operational bond. It is the last bucket that invites the question, so the specification answers it directly: the bond buys a share of that 15% and nothing else. It does not enter the weight formula.
That distinction is the whole design. If capital could buy weight, PoTB would be Proof of Stake wearing a different name. Because it cannot, the bond is only ever evidence — a public signal that an operator's infrastructure spend is serious — and never a claim on consensus.
The bond does not increase consensus weight. That is what keeps this from being Proof of Stake wearing a different name.