At first, the only humans willing to accept the bargain are those whose difficult lives leave them feeling they have nothing to lose; but in a year or two, these early adopters return to visit "Old Earth" with tales of their marvelous new lives—and the exodus begins in earnest.
Initially, only individuals who had endured extremely challenging lives were willing to accept the offer; however, within a year or two, these initial pioneers return to "Old Earth" with stories of their extraordinary new lives—and the mass migration commences in earnest.