Noize - In your Edit Options under Messaging and Notifications there is a drop-down box for subscribing by email to threads you start or post in.
As for if the old off-forums Marketplace will ever return, that's a question for Admin - I wish I could provide an answer because I know a lot of people are wondering this.
2014 Conventions :
Katsucon (Washington, DC) - Megacon (FL) - Colossalcon (OH) - Anime Weekend Atlanta (GA)
Upcoming costumes : Yuffie from Kingdom Hearts, Princess Garnet (coronation gown) from FFIX, and more!