While it's uncertain if costly signaling can predict long-term cooperative traits, people tend to trust helpers more.
wˌaɪl ɪts ʌnsˈɜːʔn̩ ɪf kˈɔstli sˈɪɡnəlɪŋ kæn pɹɪdˈɪkt lˈɔŋtˈɜːm koʊˈɑːpɚɹətˌɪv tɹˈeɪts, pˈiːpəl tˈɛnd tə tɹˈʌst hˈɛlpɚz mˈoːɹ.