But is that an abstract objection to the controls with a hypothetical example, or is that your situation?
From what I understand, you should be able to change to dollars just about everything declared above somewhere around $2300 (Salario Mínimo Vital y Móvil) plus whatever you pay in private school fees, prepagas, etc, that are tracked by AFIP, each month. You should also be able to get permission for a one off purchase of a larger amount where you haven't been purchasing any dollars in previous months.
If you're using savings from abroad to supplement your income, then you'd do better using up your pesos first, or going to AFIP with documentation in hand that proves the provenance of the savings (being prepared to start paying bienes personales if you have more than $305,000 pesos abroad).
Obviously people who are "perma-tourists", working en negro or otherwise not square with AFIP are basically stuck in the black market, which simply matches their employment situation.