I assume you mean in the collection.
I see absolutely no need for the pastor, vicar or whoever is leading the service to know the value of individual contributions. That is a confidential matter based on ability to donate and one's conscience.

The last church I went and donated to, they even had these cloth apertures over the basket. Which has the added benefit of making theft more difficult.

All the pastor should know is how to be a friend to everyone but yet keeping a distance. I know i am one.

Why am I flashing back to the church collection scene from Carry on Dick?

From my limited knowledge of Anglican churches, I do not think that the Pastor/Minister etc should or is necessarily aware of what individuals give. At the end of the day people give what they can/want and any dilemmas should be between them and God or 'their conscience'as per seacommanders response. However as with most non-profit-making organisations, there will be a treasurer who oversees the finances of that Church, but I think you will find that most income is received and managed on a regular basis via other means than the collection plate - which is probably too eratic to be included in the accountable income figures!
On the flip side for those who would like to be seen to give generously in public I don't think you will find much praise in any scriptures eg -Mat6v1 - Beware of practicing your righteousness before other people in order to be seen by them, for then you will have no reward from your Father who is in heaven.
Hope this is relevant!