OK, so you can source some things cheaper O/S, but what if you need it today? If there is no support for the local distributor/retailer then they'll go out of business or contract to one or tow major cities and sure, you'll get your bits cheaper, but you'll have to wait longer for them. There will be a lack of local expertise in how to fit it, or diagnose the issue. This will be fine for some things, but could have more serious implications for more complex and expensive equipment.
It is overly simplistic to suggest that because something is cheaper O/S it should be a similar price here. The size of our market is miniscule compared to the US, Europe and Asia. Our wages are higher and so are our instructure and utility costs. Where you can sell 10,000 of an item, you can afford to sell it at a lower cost, and perhaps margin, than where you can only sell 1000 units of the same item.