Ignore schmexperts. Schmexperts are the totally bad combination of schmucks who are experts--or experts who are schmucks. When you first launch a product or service, they'll tell you it isn't necessary, can't really work, or faces too much competition. If you succeed, then they'll say they knew you would succeed. In other words, they don't know jack shiitake. If you believe, try it. If you don't believe, listen to the schmexperts and stay on the porch.
Source: Five most important lessons I've learned as an entrepreneur: http://www.sun.com/solutions/smb/guest.jsp?blog=five_lessons
Contributed by: ~C4Chaos