Not necessarily, not sure about 100%. Giving sincerity can only increase your chances of making good friends, but it's not just giving sincerity! Be smart to the people around you, treat people who are as sincere as you, and stay away from those who are greedy for profits! Because no matter how much you pay, you can't satisfy their greedy desire. You just want more from them. Be sure to think clearly before paying, and don't release goodwill just because you want to make friends, sometimes it will backfire! I hope you can make the best choice for yourself! Come on! ~