All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad (saw) is His slave and Messenger.There is nothing that prevents using the method of marketing that you mentioned in order to attract customers to buy the product. This is because it does not involve anything prohibited like deception or trickery.In Islam, there is no set maximum or minimum amount of profit that one can make. However, it is recommended that one facilitates buying and be lenient with people so that he would be acting in accordance to the Prophetic teachings. Jaabir ibn 'Abdullah narrated that the Prophet (saw) said: "May Allah show mercy to a man who is lenient when he buys, sells and demands repayment of loans." [Al-Bukhari]Allah knows best. (Source: islam_web) Classified in Fiqh of Transactions and Inheritance > Sale