Exactly, anecdotal and personal evidence does not constitute as anything other than just that. However, evidence that can be observed, reproduced and tested over and over again to meet the same results does. We have literally nothing other than anecdotes and hear-say in support of these spirits. While it does not entirely disprove their existence, it really does the concept of spiritual entities no favours in support of its position.
I would much rather accept the results of "flawed empiricism" than accept the story of Joe Plumber as being undeniable, irrefutable fact. Spiritual entities have as much evidence in their favour as faeries, goblins, gnomes, elves, pixies, nymphs, leprechauns, etc. At least empiricism is making an attempt to find the answers instead of blindly accepting a story as fact.