Ps3 – DLC for PAYDAY 2 on PS3

All your purchases and DLC are bound to your PSN account, not your console. If you deactivate your account on your old PS3 and activate it on your new one, you'll have access to exactly the same content (although you'll have to download it again unless you perform a backup/restore or direct transfer, which would also move any copy-protected saves you might have).

The exception to this is if you intend to keep your old console activated: You can have up to five PS3 bound to a single PSN-account, but (due to a policy change) any content purchased after November of last year will only be available on two consoles at any given time.

You may download any content you've ever activated (paid, promotional or free) as many times as you want, it will stay in your download list forever. (Source: I've had a PS3 since relase, and even though I've replaced my fat one with a slim, my download list still contains the very first DLC I ever bought)

As long as you never create a PSN ID for your other profile, there should be no problems and you will not have to purchase multiple copies. If you sign up for a PSN ID for that user, then you could still play with that DLC, but at the risk of violating the Terms of Service and possibly getting accounts banned.

Content downloaded onto an activated console is accessible to all users on the same console as long as the console is activated with the owner of the content's PSN ID. Some content specifically prohibits this.

Content is not shared in the store across PSN IDs and only the account that purchased the content will have the ability to install the content. To share content across accounts, simply have the owner of the content activate the console on their account and install the content on the same console.

For content purchased prior to November 18, 2011, you were allowed to have that content on up to 5 PS3s, and content purchased after November 18, 2011 is only allowed to be installed and activated on up to 2 PS3s.

Sharing across multiple PSN IDs violates the TOS and some users have been banned for it.