I don't know about others' opinions, but it looks like you're looking for input, Ellay. Here's my .02
1) Adsense - Yes. This community needs to continue, and if generosity isn't footing the bill, use what does. A small minority of the community may be upset, but they'll still have a useful, and more reliable, resource to take advantage of, rather than one that's shut down or limited due to financial problems. However, if this comes to pass, I'd like the next suggestion to be implemented.
2) Monthly fee - And no, I'm not saying a monthly fee for all access. I'm talking about a very small 'premium' fee, between $1 and $2 a month. This will supplement the income from ads, and would result in an ad-free environment for subscribers. However, I do not believe the reward for a premium account should only be the removal of ads; because the multiboxing crowd is reasonably computer-savvy, it would take very little time for most to enable an ad-blocker or blacklist proxy rather than pay a monthly fee. Additional benefits such as a limited amount of storage space to upload images and a special title for subscribers would make it worthwhile beyond removing ads. Another idea that might be a lot of work but would really shine - a multibox-focused signature generator for subscribers. I've often wished to use one of those custom signature generators, but I don't want to end up with a 5-image thick signature (And yes, I'd gladly link to dual-boxing.com from my generated signature if I could use it on other forums). With all that extra value, you'd likely see a pretty substantial amount of subscriber traffic, but still be pulling in a respectable amount of ad revenue from people visiting to learn about multiboxing - all without restricting any actual content from the public eye.
3) Aggressive ad filtering - As a former webmaster, I know it's a very tall order to block out gold-selling ads, but I believe the attempt should be made. I would not be happy to be sending people here for information, insisting that multiboxing is legit, and having them see ads for gold-sellers. ;(