A Christadelphian's primary hope is to live forever in a future state of bliss, surrounded by fellow believers and worshipping Jesus and God for eternity. No more sorrow and suffering, no more tears, no more pain, no more death. So the promise goes.
This utopia is apparently available to anyone who wants it. Just give up your ambitions and freedoms in this life, and submit yourself as a slave to a magical, invisible being, and you will be rewarded with more happiness than you can imagine. The sacrifices you make in this life will be more than repaid in the next, and the suffering you endure now will be insignificant compared to the glory you will inherit later. Feeling lucky?
But what are these merchants really selling?