>>biorac+(OP)
You could also incentivize early adopters. For example, if you're in the first 100k users, your money/upvote goes twice as far. Something like that.
>>all2+KV
Or something like, seed quality content for rewards (post links that end up getting lots of upvotes = free subscription) sounds pretty close to OPs original idea anyway, just give better terms for early adopters.