Yes, it is for spam prevention. Thankfully it never seemed to be as much a problem on the marketplace than on the forums, but the rule is there regardless.
2014 - Upcoming Conventions :
Anime Weekend Atlanta (GA) - FandomCon (FL)
Upcoming costumes : Princess Garnet (coronation gown) from FFIX, Edea Lee (various costmes) from Bravely Default, and more!