Investing in the stock market is risky. Everyone knows that (or should know that). Some stocks go up, and some go down; TW was one of those stocks that went down (all the way down).
But no one buys an airline club membership to make money, so the comparison is not useful. Anything AA gives you is for customer goodwill (or marketing, same thing). AA bought TWA's assets, not the company itself. A lifetime airline club membership is a liability, not an asset.