I guess there is no way of estimating how much revenue was actually lost on people who typed in the wrong url and then didn't try again? Without that piece of

I guess there is no way of estimating how much revenue was actually lost on people who typed in the wrong url and then didn't try again? Without that piece of data I'm not sure if one can claim that there was a return on this investment - my assumption being that motivated buyers would still try to find the correct url.