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Passengers load onto the Megabus in old Sacramento on Wednesday, March 20, 2013. Megabus - the discount intercity bus line that arrived in Sacramento in December - is making noise and winning riders here with unique marketing gimmicks. At least a few seats on every Megabus to Reno or San Francisco sells for $1 - if you book early enough. But, as of this week, even if you book just one day in advance, your Wednesday ticket to Reno would have been $6 and to San Francisco $4. Can such a cheap service survive?