Quick answer before I hit the sack tonight.
Depends on the program. Most will allow you to signup without having to list a site while others will either deny you or will question your marketing strategies if you don't have a site or if you put in a fake site name, or have a broken site. Just be honest with what you are doing and any smart affiliate manager should be able to see it.
Personally if you have that sort of reputation power that your friends value your opinion that much I would recommend you start your own site or your own blog and make some good money at it. You can of course do it by emails but it is up to you on how to do it but to make sure you are not just spamming your friends. I had a friend do this to me once and I flipped out but that's just me.
I do think players can and do make the best affiliates. They have played the games themselves and have figured some things out on their own and can now guide/coach other players to things they can trust. Some of my best affiliates are players themselves so they truly understand things from the players' point of view and work hard to take care of them.
ok now sleep 
John
thisisvegas - the heart of gaming
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