A SALESMAN was fined a total of $155,000 in the District Court yesterday for possessing more than 3,000 counterfeit electronic game cartridges which he intended to sell. Chan Wai-yin, 24, pleaded guilty to seven charges of possessing for the purpose of trade or business goods to which a forged trade mark was applied. In sentencing, Judge Gould said: ''He [Chan] committed an offence which not only does himself no credit, but also does no credit to Hong Kong.'' He said the irony was that the fine Chan was going to pay was significantly less than the appreciation of value of his Sha Tin flat over the last 12 months. Chan was given two months to pay the fine. Judge Gould said Chan could raise the sum either by selling his flat, or some other means. His counsel, Kenny Lin, said the flat, valued at $1.5 million, was jointly owned by Chan and his two brothers. Prosecutor K. S. Kripas said the goods, worth $500,000, were seized by officers of the Customs and Excise Department from four different premises in Sha Tin on March 23, 1993. The seized property included empty game cartridges, game labels and plastic boxes. Chan admitted that he owned all the items seized from his flat and that he had temporarily stored some other goods at his sister's flat. In mitigation, Mr Lin said his client would only have made a profit of about $40,000 if he had sold the seized counterfeit goods.