Sector guides usually repeat the same advice with the industry name changed. These do not, because the numbers genuinely differ: a legal lead and a manufacturing lead are separated by an order of magnitude in price and by a year in cycle length.
Each playbook covers what leads cost in that sector, what the buying process looks like, which timing signals are visible from outside, and where the B2B opportunity sits when the obvious market is consumer facing.
The common thread is that cost per lead is never the deciding number. Cost per closed deal is, and reaching it requires knowing the conversion shape of that specific industry.