JMHO, vacation, i.e. Vegas, flights are part of the fun, and I'll pay a little more to have the best flight times/hours/total trip times. I don't fret about $100 or so more than the cheapest fare if it gets us 1) non-stop, 2) shorter total trip time, 3) arrive in Vegas by at least early afternoon, 4) arrive home no later than early-mid evening. That's worth the extra money, when I can find that perfect flight schedule. And I'll keep looking until it presents itself.
Candy