The reason for stressing the difference between pure and speculative risks is to highlight the fact that pure risks are normally insurable while speculative risks are not normally insurable.
It is difficult to be dogmatic about this as practice is changing and the division between pure and speculative is becoming more blurred as time passes. Take the case of the credit risk which we listed under the heading of speculative risks. The goods have been sold on credit in the hope that a gain will result but a form of credit insurance is available which will meet some of the some of the consequences should the debtor default.