More is actually not better, if what you are adding is of lesser quality than the rest of your offerings. Highly favorable or positive things are diminished or diluted in the eye of the beholder when they are presented in the company of only moderately favorable or positive things.

This is an intriguing article on add-ons. It is based on an interview, but there are interesting tidbits later in the article on consumer behavior.

Psychologists Kimberlee Weaver, Stephen Garcia, and Norbert Schwarz recently illustrated the Presenter's Paradox in an elegant series of studies. For example, they showed that when buyers were presented with an iPod Touch package that contained either an iPod, cover, and one free song download, or just an iPod and cover, they were willing to pay an average of $177 for the package with the download, and $242 for the one without the download. So the addition of the low-value free song download brought down the perceived value of the package by a whopping $65! Perhaps most troubling, when a second set of participants were asked to play the role of marketer and choose which of the two packages they thought would be more attractive to buyers, 92% of them chose the package with the free download.

As marketers we tend to find more and more to throw in, we call them soft or no-cost add-ons. This is intriguing to see that may be negatively impacting the offer. I guess when I look at it as the consumer, the more stuff there is doesn't necessarily make it worth more in my eyes. Something to test for sure.