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RE: A Smart Contract Platform Without Transaction Costs or the Need For 'gas' Will Finally Offer Proper Incentive To DApp Developers. An 'Ownership' Model Will Always Be More Efficient Than A 'Rental' Model In Terms Of Entitlement From Stake.
Just to address the development costs that you mention.
Ethereum allows developers (well anyone) to set up test networks on which they can mine test ETH tokens (https://souptacular.gitbooks.io/ethereum-tutorials-and-tips-by-hudson/content/private-chain.html), which can then be used to test dapp's before being deployed.