WOTC - Open tender system

I asked this question in the Wisdom of the Crowd:

Should the open tender system be used all the time?

Here are the responses: (41 Votes)

44 % - The open tender system can be easily rigged to favor cronies.
29 % - It should be used for all contracts.
15 % - It should be used only for large and special contracts.
12 % - For standard contracts that are used frequently, benchmark pricing should be used.

See the pie chart at: 
http://www.wisdomofthecrowd.sg/chart.aspx?ID=786