I hate to say it but to me, it boils down to the loose standards the nurse practitioner field has created. There are so many NP programs with multiple formats (campus based, online, combination of both), dual entry models (direct entry, traditional), multiple certification boards competing against each other (ANCC, AANP, AACN, PNCB, NCC), disagreement over entry degree requirement (MSN vs DNP), a separate organization for NP faculty that is not a regulatory or accrediting board (NONPF), and an accrediting body that has no exclusive interest in the NP field (AACN). The result is a group of disconnected entities with their own separate agendas none of which involves creating a seamless, consistent, and rigorous training program for future NP's. Come on, the best we could come up with is a so-called Consensus Model that ironically does not reflect a consensus across NP's in clinical practice but rather a statement of meeting minutes from an agenda created by non-clinical leaders of disconnected organizations who could care less about improving clinical practice.
Currently, NP preceptors are unpaid, volunteer faculty. Some faculty members in any given university may have dual appointments as faculty and clinician in a clinical area of practice and may precept but I have not known of any program where preceptors receive separate compensation for precepting from the educational institution that is housing the NP program. There is no incentive to precept other than being granted credit toward recertification. Precepting takes effort and it adds the burden of taking extra time to provide teaching in addition to the typical patient care activities NP's already engage in. As a result, it is typically the well-established universities with long-standing affiliations with teaching hospitals and medical centers who have the ability to arrange clinical rotations for its NP students. I work for an academic medical center where the NP's on staff like myself are expected to precept students from the NP program the medical center is affiliated with. That does make it easy for the students in our university but others in different programs certainly suffer.