We keep talking about medicine but have yet talk about the illness we wish to cure.
Why do you want double xp anything? Because it takes too long to level or you are just bored and want some excitement in your play.
Why do you want double gold events? Because raising cash is pathetically slow.
- short aside: IMHO XP and gold are the same thing. Both increase the power of your character. Actually gold is better than xp because better gear can twink your toon but you don't get punished by needing more xp to level like when you are higher level.
Why do you want double ability events? Ability training takes forever.
I would suggest that if the game were better paced then we wouldn't need double anything events. OTM would use them only for marketing (fewer people are logging in so they need to juice the population). And this would only be needed if they didn't have any new content to release which would do the same thing.
All these events do is reduce the shelf life of existing content. Think about it. Let say the average player gets 4 hours of gaming in a day, and since it is a freemium game, they don't buy lix very often because they are cash limited. But because of the event they put in 12 hours each day and they bought lix when they normally dont. So instead of 8 hours of content being consumed in the weekend, they consumed 192 hours (24*8) of content. So instead of 2 days, 48 days got consumed. That is a month and a half of development time OTM now does not have before people start complaining again.