I pretty much agree here. I quite often like to browse through old threads to measure how the sentiment was back then, how people were advicing each other to cash out at $500 before the price starts to crash, etc. Instead of deleting threads, just lock them. It means that it won't attract any more spam, but people can still browse through them. Instead of moderators focusing on old burried threads, they should do some active effort to combat recent spam, because that's what we need. Lock old threads, or move them to the off-topic section where people don't get paid to post, deletion is meaningless.