So, yeah. Quite the night-vs-day difference between GLBSE with 30-40 stocks that all lost money, and that all together traded for a few tens of BTCs over a lifetime and that all together were worth some tens of ks and that all together made some hundreds a month on one hand and MPEx with its close to over 1mn BTC market cap, with its > 100k monthly traded volume and whopping thousands of BTCs to be distributed to investors each and every month. Quite the night-vs-day difference.
Just to nitpick a tad, there were a couple of non-losing assets on GLBSE (like the ones you mentioned, the passthroughs to MPEx). But your overall point is valid, the percentage of losers on GLBSE was high.