I find all this a bit extreme. I have almost all PA plugins but I have more emotional connection to my morning cereal than I have to PA. This is a plugin developer that sells software in a very crowded market of comparable products. Nothing more and nothing less.
But if I am really true myself, the money I spend on PA per year by far exceeds what the personal subscription offer would be. Sure, subscriptions are more annoying in terms of financial planning as they tend to become part of your monthly or annual fixed expenses and are something you don't normally think about in you day to day spending. But if you do your financial due diligence and have a firm grip on how you spend your money over the year there is nothing wrong with a subscription. In the end you need to chose the option that makes more sense for you financially. And you need to do that by being completely true to your own purchasing behavior.
I have not yet made up my mind. Maybe I do the subscription, maybe I don't. The only thing I know is that I would not spend 200$ on a PA plugin which is why the voucher question is relevant. If I don't go with a subscription and there are no vouchers anymore, I would re-adjust my attention to other developers. But there is nothing dramatic about that.