In this paper, we provide an evaluation model for marketable quality and profitability. We define the marketable quality as a qualitative aspect of profitability. We apply the real values of some leading manufacturing corporations in Japan to our proposed model to analyze its accuracy. From the analysis, we found that theoretical and real standard values of the marketable quality indicator were very close. This shows that the proposed model has a good approximation. From the fair relation of network service providers and users, we present the network pricing guidelines and extend our proposed network service pricing model considering network externalities.