You can pay with TAR tokens for robots, robotic parts (like robotic wrist which can be used as a prosthetic limb also or hydraulic valves block which can be used to build your own robot), for robotic software (like program which makes a robot to deliver beer to you from your fridge), for renting robots, for voting and crowdfunding for a desired robotic software, or you can just sell your tokens on the cryptocurrency exchange to another guy who needs to buy a robot or do something from a list above, and of course you can hold tokens waiting when its price will go up.