Depends on the amount of the debt. You can always get a quote. The problem is this way you forfeit the majority of your money.Thus for most people this is not a reasonable option.
The problem is that you need to be able to provide proof of the debt which would stand up in court. Debt collectors don't just take your word for it that someone owes you money. Their biggest bargaining chip is threatening to take people to court if payment is not received. They can't even continue to ask people for payment if they can't provide proof of the debt to the creditor on demand.