I disagree. If you're a startup, you're better off using a more mainstream language. I'm from India and if I start to find a good Haskell or Scala programmer I'll be looking for a long time and I'll be paying him/her a lot for those skills. Being a startup, you start small and its tempting to start using the bleeding edge technologies, but you must do a cost-benefit analysis; coders for PHP and Java are much easier to find and since the supply is more, the cost of skills will be less.
Bootstrapped startups should particularly be wary of using technologies that have a very small talent pool in their part of the world. Use new/rare technologies if the benefits of using them outweigh the hassle and expenses of maintaining and extending the team/codebase for it.