Schwab claimed the advisors stole trade secrets and breached their contracts when they switched to Morgan Stanley.
The suit alleges that celebrity influencers and promoters did not disclose they were paid to pump sales.
Legal experts say the celebrities' prominence and wealth make them a juicy target for investors looking to recover some of their losses.
The judge fined Gross and his wife $1,000 each and ordered them to do two days of community service.
The neighbor's attorney also said Bill and Amy Gross lied repeatedly when they testified.
The billionaire offered to remove some of the high-volume speakers that a neighbor alleges are a nuisance.
The judge is preparing for a trial over allegations Gross harassed a neighbor by loudly playing the theme from "Gilligan's Island."
An online stock tip provider was accused by California of illegally selling investment advice without a license.