Have you ever considered publishing customer reviews on your web site? First read the Wall Street Journal article "Giving Reviews the Thumbs Down".

Customer product reviews are popular among online shoppers and an increasing number of merchants are rolling them out. But some retailers are struggling with how they should handle a flood of submissions, and [...]

“We’re not looking to have our investment dollars spent on R&D or building a market,” Nicholson said. “We are buying companies that have a customer base.”
Also, Vector signed a marketing and distribution agreement with Google.
Read WinZip purchased by turnaround specialist

Software is a service, not a product.

There are dirrefent factors that may affect software price:

Updates
Customer support
Training
Add-ons and third party services
Competitor’s prices
Hardware costs

Read the article by Robert Lefkowitz Calculating the True Price of Software
Is there an economic model that can demonstrate the true worth of a piece of software and the option for support, maintenance, [...]