If you actually earning 5% then there is no harm in sharing beacause if any one interested will join else let them say whatever you will earn 5% anyways. So by not sharing its a obvious alarm for scam.
By sharing i would assume you mean the exchanges i am using for this? if yes. Sharing may jeopardise, because the market can easily be flooded. By doing this it means i can only do this for 10/ 15 people which will not raise alarm bells at the exchanges, and the offer will be green for a foreseeable future.
By the way 5% is the average earnings. means sometimes it fluctuates in my favour and sometimes goes below 5%, however after putting all the variations into account 5% is what i can guarantee, i wont fail to pay my investors.