I would, if I bet on sports other than fantasy, but I don't.
And I'm not saying they set a "low total". You don't understand how Vegas is in the business of making money? This is an easy concept.
Vegas sets an over under somewhere where they have analyzed and know they can maximize their money. If they set it at 90, and equal amounts of people bet both over and under, they make a bunch of money, no matter the outcome. If they set it too high(based upon their assessments/analysis of the situation with both statistical data and anecdotal data) at say... 100, then everyone takes the under, and Vegas loses. If they set it too low, say 82, then everyone takes the over, and Vegas loses. They analyze these numbers, and set them where they do, based upon numerous factors, in order to maximize their gains. If they set it at 90, then you'll have some people betting the over, and some people betting the under, and either way, they can make money, no matter the outcome. Their goal is to keep betters split evenly between the over and the under. They don't want everyone taking a guaranteed over, because then they have to pay out on all bets. They don't want everyone taking a guaranteed under, because then they have to pay out on all the bets. Setting a moderate number, and keeping the over/under betters split fairly evenly, is win-win for them.