Does anyone have an idea on how to guess or find out how sales of a subscription based game would be affected by cuts in price, say from a baseline of $10/mo?

Does anyone have an idea on how to guess or find out how sales of a subscription based game would be affected by cuts in price, say from a baseline of $10/mo? I've always thought that $10 is so little that the biggest barrier to paying is just the reluctance of getting out the credit card or the idea of paying at all, but maybe that's wrong.