A British Columbia judge has sentenced a fraudster to two years less a day of house arrest for bilking an “extremely vulnerable” client out of $155,800 that he frittered away on gambling. Kenneth David Derksen, a former consultant at Investors Group Financial Services Inc., pleaded guilty last year to fraud over $5,000 for sending the money to himself in e-transfers from the accounts of a client, John Boellaard, who was out of the country, and a…