After much experimentation with trying to use "webfonts" for production quality consistent looking website designs, here is the best practice guideline I have converged to. For anything larger than 16px in font-size:

If it were not for the pinch zooming on iOS devices, it would've been Cufon all the way.
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If you sell font licenses for the web usage, please please make them Cufon friendly. No self-respecting pirate will ever care to convert obscured Javascript outlines back into mangled OTFs, when it is far easier to find the originals on torrent sites. But having a Cufon option will make the fonts far more attractive and useful to the web designers.
If you are set on a service business model with recurrent charges, consider offering Cufon .js the same way you currently offer @font-face files. In the end this is not about paying less or more, it is about having a website look the same on all platforms. Something that is currently impossible to do with just the @font-face.