Control Panel > Users > Manage User Accounts > Advanced
At the bottom, "Secure sign-in" - take the tick out of that, and Apply.
That makes it about as trustworthy and reliable as stories on Fox News
(And yes, I know, MS do the same thing with v1 of any of their Windows OS's - never trust 'em 'til SP1 comes out)
However, this means potentially you'd be linked with what the last purchase was before the cash was returned "to the system". Which could be interesting...
I'd tend more to think that the low figures equated either with a) reclassification or b) having got rid of some people who were constantly trying.
Also, how do you know they were repeated access attempts on a site, rather than attempts at many, many sites, all of which got blocked for some reason or other?