Competition Referral Links

Twice now today and yesterday other users have stuck what they call a direct link to the competition in the comments of competitions I have posted.These have been referral links that give them an extra entry for anyone who enters through their 'direct' link. Both times there has been no need for a 'direct' link as I have already provided it and it was not my referral link which I could have used if I was sneaky. I don't find it fair when I am taking time out to post competitions for others to come along and try and profit from that.If it continues I will just stop posting and then everyone will lose.I don't want to come across as ranting but it is very unfair not only to me who has posted the comps but to everyone else who thinks they have an equal chance of winning when in reality all they are doing is entering and giving someone else a much higher chance.Let's all just play fair please.