I've thought about purchasing, because I do think CCL will continue to exist as a company.
However, if they declare bankruptcy and reorganize, that stock is worth zero.
In the past I've wanted to buy stock for on board credit on Carnival; but that program is not a given (nor are it's dividends). I'm no longer cruising Carnival, but have looked at HAL (for Antartica) and Princess.
In the end, I think it's too much of a gamble for me. $800 isn't much to lose, but I think the chance of bankruptcy to discharge debt is very real.