I think the reply up above by "Continental" is right on target.
A separate comment re: the surprise that half of Americans would forego vacation for money: Think about it. The incomes of half (or greater) of the people in America require that they maximize opportunities for income. Living on minimum wage or even slightly above, for the most part, is VERY hard. I do not think "half of Americans" are on logging into this Forum, much less even dreaming they may someday fly to Europe. They are trying to pay the rent, save for a home, pay off student loans, or just to hope to make a little extra over-time money to have a nice little modest dinner out.
I know........my household was there 46 years ago. We often recall those days, thankful that our hard work paid off with some travel splurges decades later. For some, they recall those hard work days, with just pride that they were able to always keep food on the table. There are many tradespeople in our community who work side gigs on the weekend (outside their normal work week) for similar reasons. They are hardworking people, trying to get ahead. Some people work three jobs.
Let's not judge, for "by the grace of God, there go I." In my case, "there went I."
Comment re: the time vs. money FOR THOSE WHO CAN OTHERWISE AFFORD, we are in the camp that time is (sometimes)money, and even further, we pretty much practice the rule of "will this make our trip more comfortable, more memorable, etc." We take fewer vacations than many on this forum, but when we do take trips, we will spend extra for nice hotels (usually locally-owned boutique type places), great guides, special access at sites, nice airline seats, comfortable/safe transport to/fro airport in overseas cities, higher-end/reliable tour companies, and reasonable departure/arrival flight times (and reduced connections where possible. But, I also spend some time watching specials, early-booking discounts, tours that might include business class special airline fare, etc.
But, that said, we are still big DIY for home projects, yard work, painting/prepping rental properties, etc.....even giving the dog a haircut. Everyone sets their own priorities in life. I have NEVER had a housekeeper...never...even when I worked 80-90 hours a week at the height of my career. Life is a matter of trade offs. We all make them.