Players hate dying a lot, and the Red Dragon has a knack for killing players efficiently, scattering them away from others to make it hard for revs. Maybe they are wary of their kill/ death rates... so unless they are on X3 elix or trasher or if they aren't bears with good str gear, then expect a lot of deserters.

Invite guildmates on your runs, they won't abandon you... or befriend people who will stick through thick or thin And always talk about the expensive pink drops you get there compared to the cheaper pink drops you get on Dragon Nest. A little friendly chat on runs help people stick with you