When Ts don't take insurance it's for a lot of reasons, but not because they are better at their job. Therapists of any licensing are not required to take insurance at all but many do. When they don't it's often because dealing win insurance is such a headache and because the reimbursement rates are so low. It's also not uncommon for well known Ivy League psychologists and psychiatrists to stop taking insurance once they've reached a certain point in their career. Again it's not necessarily because they are too good for insurance but rather so they can have more control over their practice and be selective about what clients they take on.