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Listen Carefully Knowing what startup advice to take and to toss is important. Hear what others live by.

By Nichole L. Torres

Opinions expressed by Entrepreneur contributors are their own.

Some people are full of business wisdom, while others, well,aren't. These entrepreneurs reveal the startup advice of thewise and not-so-wise:

Ike Iregbulem, 30, founder and CEO of Opulent Lifestyle, amembers-only, VIP luxury concierge service in New York City

2005 projected sales: $2 million