Thanks!! Absolutely. That is something we're wanting to implement as soon as possible. It's awesome to have 1800 subscribers, unfortunately the economics of that is not so sustainable. We still haven't decided how we are going to roll out such an invasive change, but hope to do it so people understand and are happy to continue their support.
Depending on your growth, you could just lock the early adopters in at the current price.
If that isn't sustainable, even a dollar more for the early adopters and $2-2.50 more for new adopters might work. Of course I don't know what your overhead is.
And sorry for double post... What do you think would be a fair price? Would love to hear HN's point of view.