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How about this for an awesome sales pitch!

Depends what you are trying to achieve.

Conferences with a large representation of vendors (like Dreamforce or Sales Hacker) are great for keeping up with the latest fancy sales methodologies and tools but not that useful for prospecting.

For prospecting, its all about finding and creating meaningful relationships with potential buyers. I've found conferences that attract more decision makers (or key influencers) and provide opportunities for 1:1 networking deliver most value for money. 

The recent Sales 3.0 conference in San Francisco was great for prospecting,. It attracted many senior sales people and made it easy to network with round table seating, interactive breakouts and cosy food and drink settings.