How should development be paid for?"One of the greatest challenges of building a crypto currency platform is ensuring you create a decentralized system of governance to manage, fund, maintain and expand the project"
I will select 3 examples, and you can decide which model you prefer.
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Bitcoin: Development paid by the Wall Street Casino

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Monero: Development paid by people losing money on a gambling website run by a developer

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DASH:
"Through the network of full nodes and the collateral requirement, Dash already possesses a decentralized network of Masternode operators that are invested in the future of the currency. As a group, these owners can act as stewards of the core protocol development and promotion. We have implemented a decentralized management system based on a Masternode voting mechanism."The choice is yours.