Ok everything I have read here leads me to a couple assumption. Firstly it appears that if you change from points based to referrals you get 1 referral per 50 points earned, so if you have 1000 points you should get 20 referrals. I have also read that you need 13 referrals to get the mac mini on desktops4free, but you need 1300 points. So it appears to me that if I change my account to referral based now after I have my 1000 points then I should have 20 referrals which should be enough to get a mac mini. Something seems wrong with that, it seems like cheating basically. Or maybe I have read wrong or misunderstood something.
Points don't convert to referrals. The only credit retained in that situation is your original offer completion.
I didn't think that sounded right, thanks for the info.