This from Techonomy discusses difficulties with the crowdfunding model – from a US perspective, but much of it is applicable to the UK.
See also: FSA acknowledges that crowdfunding exists, says that it is only for sophisticated investors
The JOBS Act: Relaxation of rules for IPOs and private placings, and encouraging crowdfunding
The JOBS Act: Helping start-ups and crowdfunding, or jeopardising investor protections?
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