The judge said Ross' actions had "blighted the remaining lives of the often elderly and all innocent citizens".
"Effectively, your hubris has wrought incalculable harm to many hundreds of people."
Prior to RAM's collapse, Ross had led investors to believe they had $351.5m in client portfolios.
Among Ross' victims were a couple who had given over their life savings in the hope of securing funding for their autistic son's future.
"This was to be the nest egg for the future care of our mentally disabled son," the wife told the court through their victim impact statement.
They were planning to put returns earned from RAM investments towards a home for their son where he could live with others under supervision when they were no longer able to care for him, she said through tears.
Another of Ross' victims revealed how the ordeal had led to him being suicidal.
The investor said he and his wife invested $1.4 million in the company.
"It was the capital reward from years of hard work and stress."
The pain and anguish had even been too much for the man to draft his victim impact statement, which had to be written by his wife, he told the court.
"I was not up to it, I was suicidal."
WHERE TO GET HELP:
If you are worried about your or someone else's mental health, the best place to get help is your GP or local mental health provider. However, if you or someone else is in danger or endangering others, call police immediately on 111.
OR IF YOU NEED TO TALK TO SOMEONE ELSE:
• 0800 543 354 (0800 LIFELINE) or free text 4357 (HELP) (available 24/7)
• https://www.lifeline.org.nz/services/suicide-crisis-helpline
• YOUTHLINE: 0800 376 633
• NEED TO TALK? Free call or text 1737 (available 24/7)
• KIDSLINE: 0800 543 754 (available 24/7)
• WHATSUP: 0800 942 8787 (1pm to 11pm)
• DEPRESSION HELPLINE: 0800 111 757 or TEXT 4202