Based on the calculation of survival probabilities, we suggest a procedure to assess the value of G3P, the triple pomeron 'bare' coupling constant, by comparing the large rapidity gap single high mass diffraction data in proton-proton scattering and J/Ψ photo and DIS production. For p-p scattering the calculation in a three amplitude rescattering eikonal model predicts the survival probability to be an order of magnitude smaller than for the two amplitude case. The calculations of the survival probabilities for photo and DIS J/Ψ production are made in a dedicated model. In this process we show that, even though its survival probability is considerably larger than in p-p scattering, its value is below unity and cannot be neglected in the data analysis. We argue that, regardless of the uncertainties in the suggested procedures, the outcome is important, both with regards to a realistic estimate of G3P and to the survival probabilities relevant to LHC experiments.