I forget the actual figures now, but wasn't Enterprise only shown in 70-80% of households?? That may have something to do with it.
RAMA
UPN at its peak had about the same coverage as the Sci-Fi Channel at the time. That's why I always found the rating debates comparing nuBSG and ENT interesting because we had people on the one hand saying nuBSG was such a huge hit for Sci-Fi because it was 'so well written'; yet ENT usually beat nuBSG's ratings by a fair margin with ONLY the 'Network airing' counted (the weekend airings of ENT were never included, had they been overall rating would have been higher); while nuBSG used the cable ratings model counting all airings of a giveen week - YET many of the same people who praised nuBSG, liked to clain ENT's ratings were so low because the writing sucked.