That's incredibly simplistic and reductionist way of thinking. That would mean that the most touristic places in Europe should see the most benefits because tourists leave a lot of money and 50% of that is better than 100% of nothing according to you, but the result is the opposite: those places have the crappiest jobs and wages and the most overpriced housing, resulting in the biggest wealth gaps nation wide.

If average workers gets nothing from that 50% of that something, as it all goes in the pockets of landlords, then they're better off with 100% of nothing as at least that will not cause their rent prices to spike. Because doing what you're advocating for, all you'll have is a large pool of wealthy foreigners spending their money raising property prices and the only jobs they create are low income ones like bartenders, maids and pool cleaners, not something you can improve an economy on. Welcome to places like Greece.

Like I said, you want to attract investors who create jobs for the locals, not more tourists who just raise living costs and only enrich a few asset owners while the locals stay even poorer as they don't benefit from that 50% of that something.

Politically and socially, you're better off doing something that increases the upwards mobility and quality of life of the bottom 20%, than boosting the wealth of the top 20% hoping for some trickle down from that to eventually reach the bottom 20% as well because that mostly never happens.