Because it's the way it has always been done. It's how everyone does it. This is how we have always raised money. This is what we do. These are all terrible reasons to do anything.
Think differently. Think bigger. Push boundaries. Try new things. Come up with new ideas. Be creative. Be different. Be daring. Be special.
If you aren't going to keep pushing, then you should pack up and go home. We need better than there was before. We need new ideas and new ways to do things. We need to strive for great, not good enough. You are never going to be the best of the best by doing what you have always done. You aren't going to be remembered for doing things the way everyone does them. Your crazy idea might just become industry norm in a couple of years. Keep thinking and pushing and changing until you come up with what you are looking for. Once there, start thinking and pushing and changing again.