Loyalty & Commitment ... What are They?

I recently posted this on TED Magazine's LinkedIn site and, it seems, it's gotten buried, so I thought we'd re-start the discussion here.

We're working on a project with a manufacturer and during our discussions the topic of "loyalty" and "commitment" came up in the context of distributor programs / rebates.  Essentially, in determining "support" to provide rebate, how to define a "loyal / committed distributor and how to reward them.

In conversations with some distributors, some felt manufacturers should consider loyalty / commitment as something other than sales volume, or sole line relationship, to the manufacturer, but they couldn't define what the "something other" should be (and be something easy to measure and that wasn't too subjective (and hence left to a salesperson to decide!)

In speaking with distributors, they want a manufacturer to be "loyal" to them and to reward them for their "commitment". Manufacturers want the same thing. But most often both parties are doing business with competitors (distributors representing multiple lines, manufacturers selling to multiple distributors in a marketplace covering a comparable customer base - since many manufacturers have barely selective or saturation distribution policies.) Both want to increase their sales and profits.

So, what should be the definition of loyalty? Commitment? Are they the same? How to define, and measure? Or just tie to sales and share the profits (rebate!)?