Don't secretly work multiple jobs if you want to advance in your career, overemployed workers say

• Some people have made as much as $500,000 a year secretly working multiple remote jobs. 
• But splitting time between roles can make it difficult for some workers to advance in their careers. 
• However, some job jugglers say the extra work experience provides valuable skill development. 

While Robert, a Gen Xer living in Florida, was able to earn roughly $335,000 last year as an overemployed worker, he said the high pay came at a cost.