Try quantifying some of these for starters...

• Relief on Sales Management Time
• Less need to continually repeat same conversations, concentrate more on coaching and face-to-face customer contact.
• Reduction of Salesrep Down-Time
• No longer lengthy periods of inactivity as the result of prolonged searches for elusive essential information.
• Consistency of Sales Operating Procedures
• Everyone adhering to the same sales process, sign-off requirements, discounting allowances, delivery promises and handover routines.
• Speedier Ramp-up Times, reps up to maximum productivity sooner.
• Prolonged careers of performers
• Once hitting numbers, churn decreases and overall sales per individual rep increases.
• Greater Sales Force Effectiveness
• Faster and better selling decisions in the field leading to more successes from extra orders and average order values rising.
• Quicker Speed of Response
• More business coming through the door because less is lost through cracks in the pavement.
• Higher Quality Sales Conversations
• Strategically set apart from rivals who don't know their onions.
• Central Knowledge Pool
• The ability for the first time to dip into the definitive help source.
• Constantly Evolving and Growing
• Unlike an in-house snap-shot, the very latest up-to the minute knowledge is always available.
• Truly Collaborative Peer-to-Peer Community

The sales team actually start to behave like one, being able to swap hints and ideas independently of reliance on any one else and enjoy doing so, with bottom-line benefits commensurate with this experience.
...and then there's always our quicker - cheaper - better mantra..!