One, pricing for add-on licensing is rarely done in a vacuum. Foundries price web embedding, just to take one, based on as assessment of the use (usually traffic) as applied to pricing tiers. So, the only choice when pricing for "unlimited clients and unlimited use with no time frame" is to price at your highest possible prices for a very high number of clients and uses. And even then you might be wrong.
Two, unless they are required to report each client project to you then you how no way knowing if a given observed use is licensed. And I'm sure they don't want to report to you since, as Pablo pointed out, the whole point of this seems to be to remove all friction for them.
If I did agree to this I'd do it for a short period (one or two years) as a test. I'd require they keep careful records so we could review and reassess the pricing at the end of that term.
As a business side person I need to build my schedule around client need. Yes, I have my own projects and I'm involved on internal projects but the key scheduling factor is when I will be needed for technical, sales and licensing support by clients.
Our clients are all over the world (as is true for most foundries) with only about 45 percent in the US and about half of that 3 time zones away from me. It works out that even though I don't need to work more than 8 hours in a day I need to be available from 7am EST (at the latest) till 8 or 9pm EST. There are gaps in the middle of the day when I'm less needed and a few key times right before various key time zones leave for the day that I need to be especially reachable. I tried to work from an office and it just didn't make sense. I ended up either spending more time there than is healthy or doing most of my work in off hours and just lounging in the office. Working from home allows me to work organic hours as needed and still have a life.
You know me, I'm all about simplicity of message. As the initial message, we tell the client that there's a fixed price per style but that we can add discounts if they request a lot of styles. As the process goes on we are essentially pricing by the master and adding a little for the interpolated styles. But if you start by trying to explain this really complex calculation then I find that you loose most people.
we've seen a decrease in the same period (not as big but still noticeable). I had thought it was because our biggest seller has been around a while and was losing steam but perhaps it's simply industry wide? Are other indie foundries seeing the same?
@Ethan Dunham - this is really interesting especially given that Dalton Maag and others have reported an increase in sales by multiples. I wonder if the difference is that they offer a complete but renamed font rather than stripped down one? Or something about their business model (especially in the case of custom focused DM) that provided them with more room to grow in the retail sales department?
The thing that has been really interesting for me is that in the few days since we have been quietly doing this - with no announcement to the public (I'm not counting this forum) - we have seen more downloads of the lesser known fonts than of our top one! So far only one trial has converted to a sale (and of the top seller) but it's only been a few days. Regardless I'm really excited to see interest in the lesser sellers.