I sold all of the stock electronics and in total made over £100 from the ESC/RX (£30), controller (£35), servo (£15), battery + charger (£15) and motor (£5)
The figures above are from memory so should be taken as a ball park figure.
The Injora ESC, motor & servo comes in at £42 so you'll still pocket a good £50+ for another RX if needed, the light kit and any other bits you want to add. Just keep an eye out for eBay's 80% fee offers.