What is the main reason for giving up?

It happens that a technician quits the calculations after having sent the information. What is the main reason for giving up? Hard to believe, but it is neither the price of calculation or way of payment (PayPal with Debit or Credit Card) but inability to measure the slot dimensions, despite the fact that the various methods of measurement and evaluation are described in detail on our web page and that only few minutes is needed to do that: http://winding.wix.com/design#!winding-data-calculation/c2x7 What to say? It's really sad.