Mariah Carey can afford any set of wheels her heart desires. And the infamous diva has chosen … a wheelchair! Don’t worry, Mariah, 47, isn’t injured. She just doesn’t enjoy, you know, using her own feet to walk all the time. “Mariah makes her staff push her around,” a source tells In Touch. “She uses the excuse that her feet hurt due to wearing heels, but she insists on it even when she’s been wearing slippers all day.” Mariah’s minions actually love the mobility device, which Mimi plans to decorate with butterflies and bling (like our rendering above), because pushing her around is easier than the alternative. “Prior to this, she’d ask her bodyguards and male dancers to carry her,” says the source. “They were exhausted!”…