You could get a ticket. And there is nothing pleasant about getting a ticket. First of all, speeding tickets are pricey, especially if you were going way beyond the speed limit, and can result in increased insurance premiums. Second of all, it makes you late for your destination. And sometimes you have to later appear in court, which also eats up all sorts of time.
Speeding increases stress. Speeding contributes to the feeling you have of being in a hurry. The more that feeling increases, the more you see everyone else on the road as being “in your way.” This can make for an extremely unpleasant commute.
Speeding can increase the risk of an accident. Speeding often means going faster than the flow of traffic which in turn means you are constantly forced to pass other drivers. This can make you more unpredictable to other drivers, making it less likely that they see you.
Speeding doesn’t save enough time. While this is not encouragement to speed excessively, doing so is the only way to really make speeding worth it, in the sense of time saved. But the faster you go, the higher the price; the more expensive the ticket, the more stressful the drive, and the more unpredictable you become to others.