If you stop reinvesting profits into R&D, the only other place to put your profit is paying out dividends to shareholders or doing things like buying back stock

If you stop reinvesting profits into R&D, the only other place to put your profit is paying out dividends to shareholders or doing things like buying back stock (which many companies start doing once they reach a point where shareholders will realize more value through dividends than they will from ROI on R&D).