Sure. But just because you're more likely to pay a new hire more than your existing staff than less doesn't mean they're underpaid, or indeed not paid comfortably above market rates for their skillset (above-market payers often have the most opaque salary structures)
Most employers able to pay market rate or better would rather attract candidates for a position that are substantially better than their existing employees than substantially worse, so the feasible salary range is naturally skewed upwards even if you pad it at the bottom. Most employees don't think they belong in the bottom half of the salary range for their position, even if they do. Something has to give, and its usually transparency.
