Bit of a ramble...
Bandwidth and costs have come up a few times throughout the thread. Bear in mind with the prices mentioned that the server is shared with enscape - although it's fairly idle at the moment, we have a good idea of what it's capable of when at full steam, so can work out what sort of spec is needed.
We're currently on a dedicated server at £60 p/m - whilst it was a good deal when we started it, it hasn't changed in that time, so we can easily get more for our money elsewhere.
We're currently going over our bandwidth limits each month, albeit by a fairly small amount - the bandwidth has been increasing pretty steadily since we moved ZG to the enScape server, and there doesn't seem to be any reason for it to slow.
Disabling of photos/images etc has come up, but the attachments make up quite a small fraction of the bandwidth, most people tend to host things themselves. We could feasibly strip the forum to a bare minimum, plain text, no avatars, graphics etc, but this still wouldn't make a huge impact, whilst making the site a rather less attractive place to be.
We'll be looking at about twenty times more bandwidth and a much higher specced server for the same or less money, so the bandwidth won't be such an issue.
Ultimately we've no intention of going with something that people aren't going to like - I have to admit, I thought people would prefer some non invasive advertising like the example shown, but perhaps that's not the case.
ZG gets quite a lot of guest traffic, a fairly even split between returning guests who aren't registered and guests from external sites and search engines. In addition to the donations there's always the possibility of having the google adverts shown for guests but not for registered members - if it's made clear that registering removes the adverts, I don't think it would be a huge turnoff for potential users. Any thoughts on this are much appreciated.
If we do decide to go for a donation system, we'll obviously see what people would prefer as far as incentives or credit for donation goes. We possibly run the risk of starting to get a bit of an elitist/biased attitude if it's made obvious who has donated and who hasn't. The same goes for if certain incentives are offered for donations, be it an @zerogain.com e-mail address, some webspace or something sompletely different - you're then getting far more into territory that would be considered more a subscription system rather than donations.
We don't want is to make people feel guilty or unsupportive because they don't wish to donate, but we'd need to find a balance somewhere between canvassing donations out of people and permenantly relying on a few anonymous donators who are prepared to put money into the site.