<font face="Verdana, Arial, Helvetica, sans-serif" size="2">if I were to encounter an insanely cheap but non-zero rate, like less than one dollar for a flight that normally costs over $2,000 (which has not yet happened to me), I would dismiss it as an error. </font>
Bet those folks who just had United honour those
25 CENT International $2,700 fares (including all taxes) are glad they did not take your view and dismiss them as "an error".