If it is not your business then you should not create purchase orders and sales orders. Especially a price of zero may even create a lot confusion in such statistics and can make the grand total useless.
Find out together with your business what the real purpose is to capture data which is not related to your business.
Frankly spoken it sounds like I gave my neighbor a good tip where he can buy his Christmas gifts, but now I want to know what he bought from there.
If I get commission for this then it may be worth to have the information to double check.
But without a proper reason I cannot imagine for what these numbers are good for.
You could consider to capture such info in Z-tables and consider it in Z-reports together with your normal purchases and sales.