"Although entrepreneurial profit (after this EP) has only recently been formally recognized as a separate item of cost (The appraisal of RE, 1983) in the cost approach, it is evident that it has been recognized by appraisers in developing their reproduction or replacement cost estimates. If appraisers had historically omitted this important element of cost, their estimates of market value developed by the cost approach would have been consistently lower than their estimates of market value by the sales comparison and income capitalization approaches to value. This has not been the case. The only logical explanation is that appraisers have incorporated EP into their coast approach estimates by either including it in their reproduction cost estimates or underestimating depreciation to account for it. Either way, it has been included in their estimates. If it had not, their value estimates by the cost approach would have always been low, which is certainly not the case.
Including a separate cost item for EP is obviously a more desirable, and technically correct, methodology. However, appraisers must recognize that, historically, they may have built this cost factor into their estimates of value by the cost approach. Thus, they may need to adjust their methods of estimating reproduction and/or depreciation so as not to count this item of cost twice."
J.D. Eaton, MAI, SRA – Real Estate Valuation in Litigation – Appraisal Institute.