Hoarding land for speculation a threat to dream of affordable housing

I have observed over the years the habit of Nairobians buying land in the outskirts of the capital city but do not develop them for years. They hold on to the parcels of land then start subdividing them into smaller plots of 50 by 100 for sale at incredible profits. What are the implications of this growing habit of hoarding and buying land for speculation?

Amina, Nairobi