Cost model

costs
C_i S_0 : initial development costs
C_u S_0 : initial per-user costs
C_s S_0 : initial per-session costs
C_e : perception and exploration costs

benefit
G = nmW(deltaK)

profit
F = G-C
F = nm(W(deltaK) - C_s - kC_e) - C_i - nC_u

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