Per my knowledge the middle east & Saudi Arabia offers a great market for user cars. People are passionate about driving the latest & trendy cars.

From your description above, you have access to a captive & engaged audience that you can market this platform to. Used card Online dealerships are also picking up in North America. Checkout platforms such as www.beepi.com & www.truecar.com. They have been able to prove the online model and also successfully raise funding.

Key ingredients for their success is they don't just serve as a portal for used cards such as auto trader, cars.com etc, instead they get involved in the buying & exchange of the used cars themselves. Thus ensuring they provide a great user experience for the buyers & sellers, at the same time there is opportunity to make money during the entire process.

With used cars being regularly sold & exchanged in Saudi Arabia, this seems like a strong opportunity. You could see better success by looking at the opportunity to solve the problem end to end instead of just serving as a lead-generation website.

I have complete experience in launching marketplaces similar to this. Happy to engage further.

good luck!