I whole heartedly support SDreefs and am a current Premium member... but to come up with a SPECIAL for ONLY new membership without offering something to the existing members is not a way to do an effective business... and quite frankly it can be offending to your existing support base... Any thriving business takes care of their existing customers while still finding ways to increase its customer base....So, for a short while Premium Memberships will be $10 off, so snatch one up while the deal lasts!
So how about offering existing members an additional 14 months on their current subscription at the same discounted price your're offering new members as show of appreciation of their existing and continued support.
I bet you raise more (and quicker) that way than with the new membership drive...