Land is finite (unless you build up, or move offworld!). But resources and land are not identical. People are a resource too.
I do understand your point, and it is true that the market rewards efficiency, hard work, luck, preparation, and capital, but the scarcity argument has been deployed many, many times and has yet to work. It just seems Malthusians and neo-Malthusians for example (not saying you are one!) are forever positing a catastrophe whose deadline is fast approaching, yet never seems to come true.
Look at the famines of the 20th century, and a true lack of food was almost never their cause.