I cannot imagine that there are very many people, more than two or three, that would spend money and time on multiple accounts for the purpose of being able to place more down votes on things. That just doesn't pass the smell test.
The first thing that comes to mind when I think about accounts with supporter status that don't participate is that they are people that want to avoid ads, or to support the site that they visit. In some cases it's probably a combination of those things.
Anecdotally, I lurked here for a couple of years before I created an account. During that time, I sometimes felt a bit guilty that I was coming here for news and entertainment and giving nothing back to the site. So, I created an account and started participating. That made me feel like I was not just taking. Later on, my desire to further support the people that do the real work for the site, combined with my desire to not be bombarded with annoying ads, caused me to subscribe as a supporter. I can imagine many scenarios where I could have just skipped straight to supporter, rather than participant. In fact, there are lots of people that don't like to get involved in discussions online because they often turn into train wrecks. But, that doesn't mean those people don't want to show some support.
Anyway, I'm not going to say that nobody is doing this secondary supporter account thing. I just can't imagine that it's a widespread issue.
Yeah i cant imagine it would be many people, but even if it was just one or two accounts is more then enough to sway things in any direction they feel.
I guess im more on about the votes in this thread, clearly the reply's in no way reflect the votes as almost everyone who has posted has been for stopping the down votes. I defo think the is Alt accounts making the voting seem one sided so i just hope the mods here look at the opinions of people in the thread instead of the vote count as thats too easy to sway.