“…For the upcoming future, the sampling methods seem to be optimized to obtain more representative samples, which would be more conducive to the stability of the research conclusions, since the non-random sample has to be treated with great care. Furthermore, from the conceptual/contextual point of view, the RI may be applicable to further research for alternative special interest tourism (SIT), such as wine tourism ( Back et al, 2021 ), coffee tourism ( Chen et al, 2021 ), gastronomy tourism ( Widjaja et al, 2020 ), astrotourism or stargazing tourism ( Li, 2021 ; Rodrigues et al, 2022 ), volunteer trip ( Manosuthi et al, 2020 ), and suicide travel ( Yu et al, 2020 ; Yang et al, 2022c ).…”