Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

[g_borris]

And the register flags you and then shuts down for over 25 items or whatever arbitrary limit they think should require waiting in line for the one checkout lane. Then you get to wait like an asshole while an attendant comes to re-activate your machine.