If we start a forum, whatever that forum is, it needs a lot of traffic, but people won't join right away if they find a few posts at the forum. With lots of posts, a user may be convinced and may sign up to participate at the forums. In view of this, is there any way to generate posts, aside from posting with multiple accounts, or getting people at scriptlance to do it?
Im sure there is a way but I dont know of any beside the ones you stated. But there are plenty of people here in the BST that would post for you at a good rate. Or maybe get friends and family to help every day by posting. Good Luck, wish i could be of more help, but im sure someone here will be able to
My suggestion is : Try to find anyone who can sell their forum database. That's the way you can get the users and Posts in bulk and looks like a established website. No need to buy related one.. You can try any forum and get the database and install it and make it look like you got users and delete the unwanted subforums. And post as many posts as you can to make it look like a established site. that's the best idea i can suggest.
After buying forum database you can start posting in similar forums and blogs about your website. So slowly people start joining. But make sure you have regular posters after that. So that they post in your website regularly.