As an LCMS Lutheran, I understand the high respect that is given to the consecrated elements, and the Pauline injunction not to eat and drink unworthily. But providing the blessed bread allows to visitor to know that s/he is welcome in the worship, and also welcome to consider the option of accepting the church's offer to come into communion by becoming worthy in Christ. In our church, as in most Protestant churches I suspect, a form of this is practiced, in the coffee-and-cookies fellowship after the service--and in our church, you have to walk through the fellowship hall to get from the sanctuary to the car :-)
I went to a Lutheran church and was told not to participate in their communion, as I went to an Evangelical church, not a Lutheran church.
Ed