While the infamy and notoriety of a heretic can often help them obtain various resources, there are some instances where money cannot be replaced. When on Imperial worlds, or when dealing with somebody who may be economically tied to Imperial wealth, Imperial Thrones are important.
Heretics can opt to ignore those who require Thrones, or to obtain said wealth. This can be done in a variety of ways. Offering up mercenary services, taking assassination contracts, robbing institutions and investing in a housing boom are all option.