There's no easy answer to this question, as it depends on several factors. For example, if you're selling tips to people already familiar with horse racing in Singapore and know how to place bets, you'll likely have more success than if you're trying to sell tips to people who know nothing about the sport. Additionally, it's important to consider the quality of your tips. If you're offering solid advice that can help people win bets, you're more likely to be successful in selling your tips. However, if your tips are based on guesses or luck, it's unlikely that people will be willing to pay for them.