The content trade: slower, better aimed
Content incentives signup fewer people per hundred visitors and keep far more of them: the subscriber arrived with the problem your business solves and received proof you solve it. The magnet must be genuinely good - the test is whether existing customers would thank you for it - and specific to your trade, so it could come from nobody else. Its subscribers open the welcome sequence expecting more of the same quality, which raises the standard for every campaign that follows; a business that cannot sustain useful mail should not buy its list with a useful magnet, because the first thin campaign will expose the trade and the unsubscribes will be the honest ones.