Maybe you want to solely sell your own products on the marketplace, or want to be the next BitMit. Bloomsfield is built for all purposes, and won't get in the way of what you'd like to do.
Upload a PGP key for secure client-side encryption of messages, and to enable features like PGP Two-Factor login to stop attackers dead in their tracks.
Bitcoin eliminate's the need for 3rd party payment processors, so no more per-transaction charges to use an online currency.
Basically the sites give to you all necessary hints in every situation. Important is only remembering passphrase for wallet at account settings - for simple signing transaction through this site. But if you need a more information you can find it here
Bloomsfield gathers exchange rates for Bitcoin, against USD, GBP, and EUR from some of the leading Price Index API's. Currently comes with built-in support for CoinDesk and BitcoinAverage.com. With this feature, you can set prices in your local currency, and charge users based on the current value of Bitcoin.
Bloomsfield takes the privacy of it's users seriously. All uploaded images are stripped of GPS information, and other meta-data. Private Messages are encrypted using RSA encryption, and completely unreadable until you login and enter your PIN. This presents a barrier to attackers and even nosy administrators.