I am on the same boat as you all but lets not make assumptions
Who said that all the donations had to come from Spain alone?
Who said that a handful of rich JW did not see this as a tax shelter? We can't take an average literally. It is just that, an average.
The actual news article says this started in 2001. The news article is also dated Jan 22. If we take the years into account when calculating the average, then you are now about 10,000 euros per year, per publisher. Still a high number, but much lower than previously estimated. Like I said, it is just an average.