I have a product and looking to make Affiliate section

Hello,
I have a product/Widget that Webmasters/Bloggers use a lot and now I made a "Pro" version which is Payable one.
I have more than 140K widget served (140K Webmasters that using the services).
Now we maid a "Pro" version for better and customize widget.
For example 3 packages (They all on subscription mode)
$5/month (Or discount on yearly) – For Bronze package
$25/Month – For Silver package
$50/Month – For Gold package

Now my question is, It is profitable to make an affiliate section so others will promote my product for a commission or the contining commission?
I saw services that gives 20% of the sale and others giving 80% of the sale.
Should I give one-time Commissionon for the purchase? Or the affiliator should get a commission every time the client he refer keep paying for the service (Subscription).
Let’s say I give 40% Comission of the sale and a client that refered by the affiliate member give us […]

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