You are not screwed for real on any sensible options setup designed to avoid anyone being screwed.
The worst that can happen, barring hacks, thefts, embezzling and such, is that you miss out on potential profits you could have made had you taken some other course of action.
For example if the DeVCoin Credit Union has ten thousand dollars on hand and makes a deal with you to let you buy up to ten thousand dollars for X number of DeVCoins the Credit Union makes a definite profit in terms of DeVCoins, not only on the actual sale if it happens but also in the form of the price of the option, that is, the service charge it charges you for making such a deal with you.
The Credit Union would already know how many DeVCoins it had paid for those dollars, thus how many DeVCoins of profit it would make if you did end up exercising the option.
So it would in effect be trading a guaranteed locked in profit against a chance that maybe it could have gotten more DeVCoins for those dollars had it instead waited for a better offer (someone offering a higher price for such an option) or for an exchange rate more in its favour (an exchange where it could buy more DeVCoins for those dollars than you exercising the option would end up providing it.)
Similarly the person buying the option would only be screwed to the same extent any insurance screws people. They could end up having paid for an option they end up choosing not to exercise, just like with fire insurance you could end up paying for the insurance then not having a fire.
So really the only unlimited losses involved are opportunity costs. You could end up not buying a winning lottery ticket or somesuch on account of getting into an options deal instead.
I suppose someone is going to argue that if DeVCoins become worthless then the Credit Union would lose a lot. But fergoshsakes it is a DeVCoin credit union, to it DeVCoins
are profit, they are value, they are "worth". Its entire accounting system is based on how many DeVCoins it has, and if it has more now than it had before that
is profit.
(Its shareholders might not think so, thinking gosh I should have invested in a dollars credit union instead of a DeVCoin credit union, but so what, either they were okay with that or they would not have invested so there would not have been a DeVCoin credit union in the first place. As long as such an institution does exist and it does gain more DeVCoins than it had it still gets to report that to its shareholders as "profit". The fact that dollars went up in value relative to DeVCoins or that a lottery ticket it did not buy did win billions of dollars or even billions of DeVCoins is fundamentally irrelevant.)
Maybe the best way to get an Olympian perspective on options is to think about the case where you print/mint yourself two different currencies then offer options between the two. Looking at it that way maybe you can see that frankly you come out ahead no matter which one gets to be worth how much more or less than the other one if you can manage to sell any at all of either one of them! (Well, enough to cover the cost of printing/minting the stuff anyway.) Plus you get paid a fee for the options themselves too! I guess ideally you would charge in bitcoins for for the options themselves, so that regardless of whether foo or bar comes out as worth more you got yourself some bitcoins regardless!
(Or charge meals for the options themselves, so that regardless of whether foo or bar turns out to be worth more you got yourself some meals regardless. Etc.)
-MarkM-