The honest answer starts with the case where it isn't: if you've never really tried, if you have plenty of time to try and get it wrong, and if you sleep well — don't pay for it. There's enough free information and it'll serve you.
Where the math changes is once you've already tried. Three failed attempts aren't three lost months: they're three months of data nobody read. And there's a physiological reason trying it alone fails more than it seems — sleep debt anesthetizes the perception of the debt itself: a week of short nights leaves you making decisions with impairment comparable to being over the legal driving limit, and you don't feel it.
Translated to your week: your baseline for "I'm fine" has already shifted. That's why the program starts by measuring, not training.
What it costs: an initial assessment of $20 USD (credited in full if you join), and $300 USD/mo with a 3-month minimum. If in 3 months, doing the minimum, you don't reach 2–8 kg or the goal we agree, you choose: I refund you or I keep working with you free until you get there. All the detail is here.