Teshuvot Maharam, Prague Edition
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תלב. ומה שנוהגין לחזור ולקדש מי שקידש ע"י שליח נ"ל משום דמצוה בו יותר מבשלוחו מיהו רוב העולם אין נוהגין כן.
Rabbi Meir of Rothenburg, his life and his works, by Irving A. Agus. Philadelphia, 1947
The reason, for the custom to betroth again a wife whom one has betrothed through a messenger, is that a personal betrothal is the greater Mitzvah. However, the majority of the Jews do not follow this practice. SOURCES: Pr. 432.