The comment section of the following article brings up the point that hiring a calligrapher to address your invitation envelopes is no more personal than printing out labels. After all, the calligrapher is a stranger, whereas you would at least be affixing the labels yourself.
Thoughts? (FYI, I have no opinion either way on this issue.)
http://www.huffingtonpost.com/2014/08/11/wedding-calligraphy-_n_5669236.html