My conscience.
Just got offered a job, but its to start Monday.
As much as I dislike where I work now, I didn't have it in me to bail on them on such short notice.
Because of the fact that nobody knows how to do what I do, and the company pretty much can't function without it being done, I didn't want to affect everybody else.
If I get another job, Id like at least a week to try to teach someone as much as possible.
Fool. Screw everyone else!
Go to your boss and suggest you deserve a payrise with all the tasks that you do.
If they fail to recognise your efforts then its bye bye