I would like to see a page dedicated to closed and old markets. Unless you've bookmarked or invested in a market, once it closes its impossible to find it again. Even if I don't invest in a particular market, I like to follow up and check the history or the comments after it has closed.
I would like to second that. I just signed on to PredictIt today. Before committing to the site I tried to find archives to get a sense of what kinds of topics have been covered previously. Though I decided to join, it would have helped hasten my decision and would likewise benefit other potential customers.
I'd also love to see an archive / easily access closed questions.
I agree with the suggestion. While the New Zealand University might do some research on the bets, most material will just stay untouched if no archive function is installed. Please open a searchable archive.