The reason has to do with economics.
Try writing a grant proposal for studies on telepathy. Outside of the army (so-called synthetic telepathy), there's not a whole lot of funding available.
In addition, most reported episodes of telepathy are sporadic and often under life and death stress. The only protocols I am aware of are from Duke and they seem to omit some of the requirements for making it studiable.
As for miracles ... they are studied. The Catholic church requires certified miracles for declaring a saint.
Surprising, isn't it? I mean, if you could determine what the CEO of Google was thinking, you could be rich. And look at the oppotunities in the extrasensory perception field.