Not sure if LTV for blue apron is in their IPO docs or not, but to put that number into perspective: their cheapest plan is $60 per week, so if they hold onto a customer for 6 months, that $1560. 20% profit margin would mean $312. No idea if those numbers are anywhere close to correct.

The magnitude of CAC and LTV are only meaningful together. A ferrari dealership might have a $5000 cost to acquire a customer and that would be a bargain, because their LTV is $250k+.