Dremmen's suggestion is a sales model that can work for a business. However, I believe it works best if you have a rather large number of products available for people to choose from and products that people will want to keep buying more of. I used to have a "subscription" like this to DAZ, which sells 3D models for rendering. There was always something I wanted to spend my monthly credit on. I could have kept it up for years. I finally ended that subscription, however, because I realized I was purchasing more products than I had time to use. (In fact, I still have models I've never even unzipped because I haven't had the time.)Dremmen said:My suggestion is to do something akin to Audible, the online book service I'm a member of - a monthly membership fee of say $5 or $10, and that in turns gets you credits - 1 or 2 - which can be used to purchase some of ENWorld's varied and useful publications. Some of that larger publications could be split up into parts, each a credit, etc.
SiderisAnon said:Dremmen's suggestion is a sales model that can work for a business. However, I believe it works best if you have a rather large number of products available for people to choose from and products that people will want to keep buying more of. I used to have a "subscription" like this to DAZ, which sells 3D models for rendering. There was always something I wanted to spend my monthly credit on. I could have kept it up for years. I finally ended that subscription, however, because I realized I was purchasing more products than I had time to use. (In fact, I still have models I've never even unzipped because I haven't had the time.).

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.