Actually there is.There is no downside for giving up luxury, anything else is just pure cope
Take you as an example. Would you like to downgrade your lifestyle to serve the country ?
Unless you have sufficient funds saved up, you won't. I know that Hans gave up his job to come and serve the country. But he could do it because he has nothing to gain financially. He's rose to the top and now what he's looking for is self fulfillment. He can be happy atleast he has done something for the country.
But this is not always the case. Qualified people may demand certain resources and these resources should be available to attract the right talent.