This is one area where I think a lot of investment in time is needed on my part to improve the tools mods have to enforce the rules (though it'll be a while before I can). This has come up quite a bit recently, I get two kinds of messages on multi-accounters:
- Perfectly reasonable e-mails/threads like this one, saying there are too many multi-accounters and why isn't anything being done (lots is being done, and as others have said it isnt as common as some people think).
- Perfectly reasonable e-mails, saying they got banned and aren't multi accounters. Sometimes these turn out to be phony, but more often than not they're very believable and just say that it's a group of friends living at the same place, or sometimes sharing the same computer sometimes.
Problem is there's no way for us to distinguish real multi-accounters from friends, there's little room for moderators to enforce the rules with discretion (it's either ban or no ban, though you should get a warning for gray area cases), and also people are putting less value in the points system and expecting games at all levels to have no multi-accounters (the points system was created in large part to deal with multi-accounters, and I do think that in high points games you're much less likely to run into this, but live games are rarely high point)
I think there's a whole bunch of code that'd help deal with these things, better ways to manage and report issues (the current system is pretty flaky and rushed), better ways to deal with gray area issues (banning accounts from playing in the same games, giving ways to warn players of friend relationships outside the site, etc), tweaks to the points system to make live games work better (tying pot size to phase length so you can be more restrictive with fewer points), and better code to automatically detect and distinguish real multi accounters (time based log-on analysis that'd also have applications in finding the most suitable games, facebook integration that'd make an account tied to something more substantial than an e-mail and would show friend relationships), tournament system support
So this is a big thing on the todo list to deal with, as the site continues to grow. Right now I can't put the hours in but I am aware of it. You should also bear in mind that we have, afaik, by far the largest set of tools for moderators to analyze multi-accounts of any site (even past webDip derivatives), so this isn't a rampant thing that's going unchecked but it is an area with lots of room for improvement
tl;dr : Acknowledged, it's not quite so bad right now thanks to an effective mod team (especially TGM) and lots of code already, but it's a top priority area for improvement