The JW belief system is one that relies heavily on guilt and shame. If you don't perform according to the WTS's expectations, the others in the group have been taught to view your poor performance (and thus "you") with contempt - in an attempt to make you feel guilt and shame and effect a desired change in your performance. In order to fit in, you have to be compliant with their minimum expectations. In order to make progress, you have to perform at a higher level. In order to achieve even more, your performance has to increase even further. If you can't maintain the status quo, it is due to a personal or character flaw, it isn't that the expectations are unreasonable and ridiculous. That's the whole message behind the "do more" mantra that permeates every Service Meeting™, Circuit Overseer's Visit™, Circuit Assembly™, District Convention™ and Special Assembly Day™.
There's also the ability to feel superior to those around you - the JW believes that what s/he is doing will allow him/her to be spared annihilation at Armageddon™, and permit him/her to Live Forever In Paradise On Earth™. The flip side of that is the fear that not doing enough will get you turned into birdfood at Armageddon™ - the sleeping in on Saturday instead of going Door-to-Door™ can be a real source of dread - there's no excuses allowed. You aren't supposed to "go on vacation" from being a JW.