I can see there is some concern lately over all of this and understand where you are going. There are some blog posts recently:
http://www.boonex.com/unity/blog/entry/Time_to_clean_up_
and
http://www.boonex.com/unity/blog/entry/IP_check_for_posts

But honestly I do believe Boonex does not have the time or resources for something like this, nor would most companies.

The internet is great, but with all the nice technology we get spammers, exploits, cheaters, multi-accounts, you name it. You see more can delete them, suspend them, or due away with them, and they just pop right back up if they so desire. Many times it's not even worth the effort, because they come right back if they really want to.

The post about the ip check really does not do any good at all. Ip check is probably the worst. If there are any dial up users out there anymore their ip's change everytime they connect to the internet, so you can't really single them out. Even if you have dsl, cable, satellite, or other broadband, unless you purchase a static ip your ip is going to change at some point. When that happens you are free once again to do whatever. You can also force your modem to get a new ip or use an almost unlimited number of online resources to get a new ip, so this is pretty much out of the question. Unless someone from Boonex wants to spend all day long looking at logs and logins to see if someone is up to something in terms of ips, I really don't think this would be productive or result in much success for points or giping a bit. What if someone is at a friends, neighbor, relative with different internet company and ip? How about college or a library? Maybe a cell phone?

If anything it would consume more time, cost money to pay someone, and really wouldn't do anything. Even so some people hire members to do work for them, and they log into there unity account to aquire licenses and this would be login from the same ip to 2 different accounts but in my opinion legit work and help.

Ip banning used to be popular, but really not as much anymore. You really need to keep up on it if you are banning ip's on your site. Even the new ip banning in d7 alpha. Because you can ban someone's ip and they can just change it and be back like nothing happened. If you don't keep up on it you will never know. If you have a small site you could probably follow it, but if you have 1000's of members you aren't going to know one login from another after while.

The points system is really a joke anyway. They don't mean squat, who really cares how many points you have. I used to follow them, but it's abused and I really don't care if you have +100 or 1. If you provide help, I don't care how many points you have.

So odd ball companies flag an account for logins from another ip, but they get a number of legitament complaints in the process.

I think you have a good thought, but it's pretty difficult to regulate or control this.