It's just that we were told that annulment could take up to 3 years and even after several hearings, when the whole procedure was completely exhausted, the paperwork would probably just sit on some judges desk until a suitable bribe was offered (through your attorney of course) to the clerk of court who would take his cut and then pass the rest on to the judge.
Then miraculously everthing would be finalised, but only if the bribe was big enough that is. We would have much preferred the certainty of an annulment as an outcome, but the total uncertainty of it happening anytime within the foreseeable future, or maybe not even within my lifetime, made us choose the other option, as risky as it may be.