Divs are a whole other thing, composed of several streams, some of them highly variable, like sales.
BTC holders (or anyone) haven't really lost any value. Before the move up that hedged the btc wave down to 68, AM was at 3.5. This move artificially pumped the AM price up all the way 5~ and it is now 4.2.
After all is said and done, AM gained ~15% by acting as hedge. The gains are probably accounted for by new people who realized during the down wave that AM was the best hedging asset
But just like Bitcoin, the more people that become involved in trading Asicminer shares, the scarcer they become, thus bumping up the price through demand. People that want to enter the mining game but want to hedge some of their risk or are simply lazy can buy shares in AM. Considering how furious mining is becoming I bet a lot of people are giving up the backyard game and simply throwing their weight behind mining startups. I don't think Asicminer is going to be going anywhere in the years ahead, and I'm reasonably certain that once people see the staying power of AM (I doubt Friedcat is going to be giving up his slice of the hashrate pie to any startups), they'll probably drive up prices further, for better or worse. Of course it remains to be seen if other BTC holders mirror my feelings but I think it's certainly possible.