The first signs that something was amiss arose pretty early. I kept some printouts of what the various metrics were in my desk. Occasionally a support employee would come over and say so-and-so at some bank wants to know how (say) Bollinger Bands are defined. I'd hand them a copy of my definitions sheet covered in capital pi's and sigmas. They'd look at it, their eyes would glaze over, they'd wander away, and I never got a single followup question.
About four years later a client discovered that there'd been a bug in a few of the calculations that made them wildly "incorrect." Many people used the product for years as happy customers without realizing this.
At that point I must have googled "technical analysis wtf" or something, and realized that basically what I had been spending my time on was the financial equivalent of biblical numerology. So it goes.