Unfortunately, I couldn't find stats on income of criminals.

This is the best I could find:

• People who live in more deprived areas are more likely to live in neighbourhoods with higher crime rates.
• People from minority ethnic groups are more likely than white people to live in neighbourhoods with the highest crime rates.
• Younger adults are more likely than their older counterparts to live in neighbourhoods with higher crime rates.

There's also "Street-level crime and its relationship to deprivation" which confirms the same again in 2026 in London.