Why are there so many organic chemists?
Because carbon chemistry, organic chemistry, is the chemistry of biology, of life in fact. Its chemistry can also be further extended.
Carbon readily forms bonds with hydrogen, to form hydrocarbons. Carbon can also form unsaturated bonds, olefins, and alkynes. Carbon also readily forms bonds with nitrogen, with oxygen, and with halogens.
So to what else can it form bonds? Carbon can also bind to itself; that is it can readily form
So much of carbon's importance can be traced to its quadrivalency; its ability to form up to 4 four bonds, present in long chains, and sometimes bound to atoms such as nitrogen, oxygen, halogens etc. along the chain. So carbon is also the basis of both protein and carbohydrate chemistry. Carbon is a very reactive customer, and opportunities for its chemistry are endless.