Are the rich less deserving of rights? Explaining the puzzle of Dutch non-referral to the CJEU of economic migration from outside the EU

Why have Dutch courts hardly referred preliminary questions to the Court of Justice of the EU with respect to economic migration from outside the EU, while they have been relatively eager to refer in the field of family migration, asylum and the internal market? It has been argued that labour immigration decisions are less contested since admission for labour is not an individual right, like family reunification. But Dutch economic migration case law raises a plethora of issues beyond admission, on withdrawal and extension of work permits and student permits, fees under the Single Permit Directive, admission of mobile long term residents from other MS, employer sanctions in case of illegal employment. In some of these cases economic rationale dominates over a rights based language common to other migration cases. Are economic migrants to place no trust in the court, not deserving of the judges 'sympathy' as economically benefiting from migration, or are there other interpretations?