Sometimes you want to state an opinion, but you know that the people you're speaking to have a different idea in mind. For example, you might think that Paris would be a bad place to live. However, you know that a lot of people like Paris. In that case, it can be helpful to acknowledge the other opinion like this:
Paris might be popular, but I wouldn't want to live there.
Or if you're trying to convince your partner to buy a more expensive pair of shoes instead of a cheaper pair, you can say this:
They might be more expensive, but they'll last longer.