Those ubiquitous 140 characters already reach an extensive audience and Twitter is certainly a very useful part of your content amplification. Tweeting like mad and connecting like crazy don't necessarily bring the results you and your team had planned. A little amplification will definitely help.
Twitter provides a number of paid organic options which can help you to reach the targets you really intend - not limited by the volume of tweets you can originate or distribute. And there is an audience for every topic and theme within Twitter today. Often working alongside Facebook activities and YouTube, a relatively small amount of media spend can demonstrate impressive results.
The amplification will always be undertaken by social media professionals who understand the true essence of the trust and belief which must be connected to your online social presence.