a subscriber thing might be good, i don't think the likes an stuff are necessary. this isn't facebook, id rather not create an environment similar to that.
i think the subscriber thing might be a good way to try an maybe use your influence? maybe get some subscriber-only content things from games-workshop, this is the most popular aos forum, worldwide im pretty sure
a monthly subscriber raffle for prizes? pay via paypal, £1 a strip winner gets a new model/box set etc etc
£50 box set, 300 people buy tickets for it, bam £250 profit - postage fees. do a little raffle on youtube or something maybe to show it