The point about chump change, in the sense of money, is that the amount varies with the context. For the divorced papa paying child support, a job that pays $9 an hour offers chump change. For the 50-year-old laid off after 20 years' service, a severance package of $200,000 is chump change. What would count as chump change Cf. rounding off money.
I work 20 years for chump change and what do I get when I leave? Chump change.