When I, as well as most expats, use the term "work" visa we are referring to the temporary residency that is granted when someone has a work contract with a business that is registered with migraciones to employ foreigners.
Just to clarify for anyone who is considering seeking employment in Argentina, expats with a work contract who are granted temporary residency and do not have a financial interest in the company for whom they work do not have to register as "responsable inscripto", or pay the IVA, ganancias, autónomo, or pay an accountant each month, or pay payroll taxes, etc.
You obviously found a great way to avoid the huge investment required to obtain an investor visa, which, in 2009 I believe was actually much lower in pesos than it is today. If I remember correctly, it was Dr Rubilar who provided the information regarding the increase in the minimum amount. Perhaps he can confirm when the change occurred and if there was actually an increase or decrease in the amount required.