It depends on where you are located, when you book the camp and if you travel at your own expense.
If you live in a place where lessons are expensive, you book outside of peak vacation times, and book your own stay + travel, it can be worth it financially.
But think of it as a vacation... It's worth it that way.
That's the problem, I don't live in those countries, so to do this kind of internship, it's plane tickets and all that.
It's going to cost β¬1800 for 5 days .
That's enormous, and I wonder if you really improve that much after just 5 days of internship!