UPTDATE: I can now withdraw from BTCjam.

Yet, I have many investments there that are not going to be paid in at least 6 months, that means I must maintain an account there.
There are also some users that only publish on BTCjam, perhaps because they are not yet used to how BLC works. I think that the main problem for newbies using BLC is their investment system.

I've talked to the admin about that, and I think they are improving the page. Anyway once you learn to use their system, it is actually better, because investors can choose the rate, while the borrower can choose the investors, which is ideal for both parties.