Offers can be added not only by admins. You can use also use User generated deals.
There are few cases when this can be helpful. For example, you have Price comparison site where you add your offers and you want to allow local shops to add their offers to Products from Amazon, Ebay and other big shops.
Another possible situation is when you have Marketplace where your vendors sell something on your site. So, you can create consolidated products where different vendors can attach their deals to common list.
You must install Content Egg (free or PRO version) from Rehub – plugins, activate Offer module, enable synchronization for Offer module and use next shortcode
[wpsm_add_deal_popup role="wcfm_vendor" currency=USD rolename="Vendor" nothumb=1]
Detailed tutorial how to use user generated price comparison shortcode can be found on our blog