Well - as I said I would the day I joined - if I bought a Genny I would become a supporting member... so now I am.
That being said....
I don't think slamming the door on adblock users with the "deal" page is in good form. In fact - it is likely to cost you more than a few _very_ contributory members - and I do not mean financially. While I understand that it costs a few bucks to run a forum like this - as I run 3 on similarly structured system - let's be real;
The cost of doing so is not overly expensive at all. My annual costs were under a hundred bucks a year on a site with over 3000 members and not charging any "membership" or "supporting" fees. Yeah, sure - it's a hundred bucks I am short - but because it was my passion I was happy to foot the bill. There were a couple of close friends who would regularly kick in a few bucks as well. In the end - if this forum is costing you anything more than $200 a year to run - even before fees/donations/supporting users - then you are hosting it at the wrong place. As you do have more than a few supporting members - your costs should honestly be nil at this point, and I'd be surprised if your host wasn't in fact paying you.

Private message me or email me if you want to know more on keeping the costs down by using the
right hosting company. Other options also include hosting it yourself (quite easy and cheap), having another member host it on server space and bandwidth they are already paying for or have access to (ahem) or even co-location hosting for a fraction of what this site is probably costing.
Now - please understand the reason people use adblock is not to have the forum cost you (or anyone else running a board) money. The main reason isn't even to block genuine ads. The real reason is to block spam, malware, virii, phishers and crawlers. While you might see the benefit of having ads on the screens of users to keep the costs down - the companies who pay your hosting company for the ad space see it as a target rich environment for exploitation and information harvesting. Nothing more. Your hosting company has no more control over the content of the code that is in that ad space than you do. They simply rent out the real estate - and statistically more than 60% of the buyers of that kind of real estate net-based forum wide use it for malicious and deviant purposes. The key thing to remember is your hosting company is not actually hosting what is in that rented ad space. All that content (and subsequently buried code) is being hosted wherever the would-be ad company is hosting it. If they want to stick malicious code in there that exploits a security flaw in a particular web browser and gains them access to your system and drops a payload on it - there is nothing you can do to stop it, nor can your hosting company.... other than once learning about it - cutting off that ad company outright. Either way - it hasn't prevented the infections, extractions, exploitations and harvestings that have already taken place.
Any time your web browser touches a web page being hosted somewhere (or ad-window within that page that actually is being hosted someplace completely different) - that page can legitimately extract a ton of personal information from settings within your web browser. The protocol has had this ability baked into it from the earliest days of the web - and even stretches back to the days of Gopher. *ANY* personal information/email addresses/settings/preference/system info/browsing history/etc/etc/etc is literally wide-open to be harvested by the site. Understand that by and large - these ad spaces are EXTREMELY dangerous - because no one has any control over them.
It's merely the nature of the beast - and it is the true reason why most of the ad-blockers out there use such products. With that in mind - I urge you to reconsider slamming the door on them and asking for whitelisting. If you don't want to pursue some of the other options listed above - then perhaps set the ad-block detection to delay or throttle the users, rather than cutting them off outright.
Additionally - your payment structure doesn't make sense. While recurring monthly subscribers are nice to have - you shouldn't punish annual subscribers in the process. In fact - as you are getting a larger chunk of money from them up front - you should be cutting them a break, not the monthly subs. Just my $.07 worth from having done this for far longer than I can remember.
As always - these are just explanations, ideas and suggestions. PLease do not take them as attacks or being overly critical. I am just trying to help you, myself and the other members on here - before it ends up costing this community more than what we could never actually be able to put a dollar value on.