Absolutely a great idea, to me it's pure logic that affiliate marketers switch over to cryptocurrency. You really can't trust any regular payment processor, my own Paypal account has been suspended for close to a month in the past, with vague reasons given.

Steem and affiliate marketing would really go hand-in-hand, you've got the blogging aspect, which is vital and you can send/receive payments without having to worry about having your funds frozen.