before tsn started showing preseason games, opening weekend had amazing ratings of over 1,000,000 viewers and the ratings stayed in the 750,000-850,000 range all season.
since tsn started showing pre-season games there's been a troubling trend, where the preseason games draw very high ratings, only to see that momentum die after a couple week. then the ratings become sub-par in the 600,000 range all year.
my only conclusion would be, pre-season games take away from the prestige of opening weekend, and perhaps fool some people into thinking pre-season quality is what should be expected from the CFL all year, or they get tired of even more of the same match-ups week after week? i dunno if that's the case, but you can't argue with the trend.
i'd prefer preseason games to be shown in tsn.ca only.