Simple answer .... No,
Most long term "investment" schemes have turned out to be scams, poorly thought our business plans, or wannaba fund managers "investing" (i.e. destroying coins) in the prior two.
Bitcoin is deflationary in nature so there is little need for interest to maintain purchasing power.
Incidentally, that's proven true with most BTC businesses, too. On average, companies or individuals looking for startup capital will likely fail within a few years.
On the same page, though. Nobody in the community has a long-enough reputation to risk sending money to for a % of interest, except those established outside of Bitcoin. It's spurred a ton of people with passing interests to suddenly start various businesses, whether finance or productive, and without a track record, you'd probably be better off just investing in upfront ponzis (bitcoinduit.com as an example) or using SDice.
