More seriously - I'm not against a paid for section (Dave has to eat, after all) but there is a risk that expectations will be raised considerably and then be difficult to meet. I know that some people have already donated and so extra content would be a bonus for them but there will be more and more people that pay, then expect premium content. As Dave is not an infinitely stretchable resource there is a danger that he comes under pressure to produce premium content to the detriment of the forum at large.
Make no mistake, this is
NOT going to be "premium" content. Anyone who has already paid thinking, I will happily refund your money.
If I do end up producing "premium" (or separate paid) content I've talked about a bit, then no one will get it unless they pay for that content on it's own. It will likely be on a different web site that handles paid content.
If anything, any extra content for the supporters will be "sub par" content. Because as you say, to produce regular (edited) content a small number of paying "supporters" will definitely be to the detriment of everyone.
How about this, the ONLY benefit you can expect from your supporter contribution is 4 gold stars under your name on the forum, and access to the private forum section. That's it. Anything else will be an unexpected bonus.
I would consider setting the contribution lower so that it comes in under people's "don't mind whatever happens" threshold - for me $25 is above that. As to an actual amount I'd be willing to pay - perhaps £10 ($16 or so) but it's going to be different for everyone.
Yes, it will be different for everyone.
Lets look at the math:
If 1000 people sign up (and renew) at $25, that's $25K/year (minus paypal fees and say 30% tax). I would consider that a really upper level number. I don't realistically expect to achieve that many people "donating". And based on current donation numbers, certainly not.
So lets say it's 250 people instead. That's $6250/year (minus fees and taxes).
If I lowered that to say $15, then it's $3750/year.
Clearly I'm not going to get rich from this.