Why will the poor be bothered when there are other things they need to be bothered of which is how to increase their income. Can you go and buy a Ferrari when you don't have any funds on you.
Land is a good asset and if it's in a good location, it will increase in value overtime. This is why the rich are getting wealthy because they put their money into assets that will generate passive income for them. A poor man can barely take care of his financial needs because he is broke.
I agree that land is a good investment especially when it is in good location and demand is increasingly high or it grows over time. But main issue is not as simple as poor people focusing on increasing their income or ignoring what other billionaires are doing. Wealth allow them to buy land because they have enough capital to invest and wait for profit to come in return.
While the People who have low income often have to use their money for the basic needs. The advantage of being rich is not that they can invest in asset but that their existing amount of wealth allow them to earn more with it and that cycle repeats in a way that wealth generates more wealth.