Is it obligatory to inform the buyer of the original room price and the amount added to it? Is it obligatory to inform him that I am a merchant who adds to the price? Is it a condition to pay the hotel for the room before collecting its price from the buyer? Is raising the room price permissible when effort is exerted to obtain it during peak times? Is that considered exploitation? Is it permissible to trade in rooms even though it is not my specialization?

The seller is not required to inform the buyer of the original price except in transactions of trust (murabaha, tawliyah, wadi'ah), where the capital must be disclosed. It is not a condition for the seller or lessor to be a merchant by profession; what is important is that the seller owned the commodity or benefit before selling or leasing it. There is no harm in selling a commodity for profit or leasing an asset for profit, and it is recommended that the profit be reasonable. Exploiting people's needs is not permissible. One must be truthful, trustworthy, and fulfill obligations, avoiding deceit and fraud. If you are an agent for a fee, you are only entitled to the agreed-upon fee.