Page Six has reported that Mariah Carey is having trouble selling tickets for her All The Hits tour with Lionel Richie. Ticketmaster is trying to boost slow sales for her upcoming “All the Hits” tour with Lionel Richie by offering tickets as part of a “buy one, get one free” promotion for the concerts, which kick off in March.The site advertises the promotional price as a great Valentine's Day gift, telling customers to 'grab a ticket for you and your special someone … all for the price of one.'Plus, Carey’s comeback single “I Don’t,” a collaboration with rapper YG, is a flop. When it dropped last week it was No. 6 on iTunes, but was No. 55 as of press time.