While I support your argument, you have to be careful it doesn't turn into arrogance.

I remember one time being promised by the tech lead on a project that an inexpensive networking solution would be just as good as the expensive kit we had used for development. Turns out he couldn't make it work - the cheap kit just wasn't as good as the expensive stuff we had developed against.

However, I was the one standing in the customer's office being shouted at by three of their unhappy managers as their time critical project was delayed until we got the proper kit ordered and the tech lead sulked back at our office.

Sometimes expensive kit is worth it.