You've managed to recapitulate his point while simultaneously missing it.
As you say, costs are negligible. Time to build something is hard to find, but nobody can help you find it.
Attention is what's really valuable and really hard to get, as a startup. Maciej is highlighting this by making an offer to startups that puts what's really valuable for building a sustainable business (I'll drive attention your way) front-and-center, while mocking the valley's mentality of take-huge-wads-of-funding-cash-and-bet-it-all-on-winning-the-growth-lottery approach to business creation with his "I'll throw in $37" offer.