It would be my strongest suggestion to Zion that he makes a DVD-5 version for torrents and people who want to pay a cheaper rate to have them burnt (and the peace of mind that DVD-R is a solid format accepted by almost every machine, whereas DL media may cause some problems). I would suggest making a DL version only for those who want the highest quality. So yes, I think it should come in both flavours.

Then for anyone who distributes them it should be standard to post the DVD-R version, and to offer the DL version along with it for those interested in higher quality (I would strongly suggest everyone who distributes to always include the single-layer version with the dual-layer version). Those are my personal feelings on the matter. The other thing, is that people who want the highest quality won't want to get re-compressed editions of your set, Zion, which means if you don't personally release a DVD-5 version, someone - or many people will recompress it. Even I probably would. They'll do it if they downloaded an 8.5Gig torrent and they only have a single-layer burner. They'll do it if they distribute and there's demand for a DVD-5 version as opposed to a DL version.