The competition needs to be carefully run in order to not fall foul of the lotteries laws. basically, if you have to pay to enter then it’s a lottery and we’d need a lotteries licence. Restricting to premier members only would mean you have to pay to enter (your subscription fee). The details are here..
https://www.gamblingcommission.gov.uk/for-the-public/Fundraising-and-promotions/Commercial-schemes/Prize-competitions.aspx
In particular we would fall foul of section 14 (2)(a) of the Gambling Act 2005 as detailed here http://www.legislation.gov.uk/ukpga/2005/19/section/14
So, our understanding is that the competition needs to be open to all with no restrictions that require payment although we are ok to insist that a free registration is required.
Restricting the megasack prize to users who have contributed to the forum is another matter that I’m happy to debate. What I will say is that this year’s winner has been a subscriber for many years despite limited posting on the forum. I’ll also point out that only 4% of all registered users ever post anything at all in the forum, which means you can be a long term subscriber who has been contributing financially to the cause for years but in all likelihood never posted anything. Is their worth greater or less than someone who has never paid for a subscription but posts daily on the forum?
I’m not ruling out any particular future option here but just laying out the details that need to be considered. I think that to date my main considerations have been 1) legality and 2) simplicity. Open to suggestions to what we do in the future though.