Cancer natives seek security the way crabs seek rocky hidey-holes, and money is one tangible manifestation of security for you.
You acquire it, accumulate it, and once you have it, hold onto it tenaciously (except when it comes to loved ones). You worry about money, too, and no amount ever seems to be enough to make you feel entirely safe from the dangers lurking out there.
You want to be paid what you know you're worth, and will move on to another job if necessary. Take care that your prudence with money doesn't turn into miserliness.