Modding has never been about cash payment, it's about the community sharing ideas and mods, if we start asking for money how long before you think the gaming company will cut us off.
Is that what happened with Second Life? The Sims series? C'mon. That's an exaggeration.
Granted, mod users constitute a tiny minority of players for multiplatform games like Fallout 3 and NV, as TalkieToaster will no doubt remind us from time to time, but it is gradually becoming a business model, especially for indie PC game developers who need to compete with big name publishers like EA, where some of the work for generating content for the game is outsourced to players and the developers have merely supplied an engine ("Mount and Blade" is a fine example of this). You are under the impression that encouagement of modding is some altruristic move on behalf of the game publisher/developer like Bethesda and Obsidian. I wish CuteUnit was here to refute this. Modding can (but perhaps not significantly, depending on the game) extend the shelf-life of a game, help generate sales (again, perhaps not significantly, depending on the game) and is sometimes one of its main attraction,
Let's take the Community Bug Fixes Compilation Patch as an example. I remember a time when a game developer would go bankrupt if they released a game as buggy as FNV, back before the DSL or cable modem was a household appliance, when patches had to be delivered on floppy disks through the mail or dial-up downloads (yeah, I've been playing games that long). That was a time when game developers actually took quality control and testing seriously. Now, couretesy of widespread hi-speed internet access and generational gaps, we (are) all (supposed to) happily accept that we have become unpaid beta testers for games that usually requires at least 2 or 3 patches before the company's tech support is no longer innundated with bug reports, where some modders are providing short-term fixes in the absence of a patch that addresses outstanding bugs which satiates some displeased customers who might otherwise be bombarding the tech support forum with complaints. In this instance, users are doing things that the product maker would have had to hire (more) people to do in the past. So yeah, there are some people who would like to get something out of it for the amount of time and effort they spend doing it. I wouldn't pay for mods but I don't blame them. Afterall, when even mod hosting sites like Nexus can't operate without user donations and financial sponsors, isn't it a bit unfair to expect modders to do otherwise?
Also, it's not as if there is an epidemic of Fallout modders requesting donations or payments, so why so concerned?