I prefer personal Add-Ons for server appeal. However, I feel that keeping good private mods secret is a blow on public innovation.
You harm the production of such add-ons by forcing it on them.
You can encourage it, but you can't just release their add-ons without their permission, how do you expect them to react?
I said it myself, I'm not happy with the recent actions of Ephialtes, and have less desire to produce further add-ons, as will most add-on makers that have their brick packs, or really any other type of add-on produced without their permission.