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Depends on how he decides to monetize it I guess. But at the very least a better designed site gives the impression of professionalism and security, and users who trust you will also trust you with their money. Also a better organized (I think less noisy) site would make the ads easier to see and more relevant.

Although for me, the bigger issue is finding what Twicsy offers that's worth paying for?

Twitter Bootstrap, a developer's greatest ally

It might solve the "unfundable" and "piece of shit" adjectives in the title.

pretty much the whole Internet is built on the idea that if you can get metrics like his up, and get funded, you can figure out monetization with the help of your expert investors.