I agree and was thinking we could do a modified points/voting system to try and combat it a bit.
In my head I was thinking
You can assign 5 albums 30 points
You can assign 5 more albums 25 points
You can assign 5 more albums 20 points
You can assign 5 more albums 15 points
You can assign 10 more albums 10 points
You can assign 20 more albums 5 points
If people just send a ranked top 20/30/50 list to me - I'll assign those point amounts accordingly and it gives natural cut off points.
This would actually encourage strategic voting/ranking - you can highlight an album you feel is an all timer that doesn't get enough attention by giving it 30 points. If your actual favourite is a stone cold classic that you think everyone will vote for, maybe you only assign it 15... but then what if everyone has the same idea as you and the one you love falls farther in the consensus list because everyone thought the same way???
I'm not entirely sure why I'm bringing game theory into an album poll, and there may be reasons that people can point out to me why the above doesn't/won't work but that was one of my initial thoughts as I drove home thinking about this today.