No, because Ghostrick Skeleton has a "hard limit" of once per turn. If a card says "You can only activate this effect once per turn" or "Once per turn, you can..." you can activate that card effect once per turn per card of that name, so, for example, if "Sangan" had an effect that says "Once per turn, you can draw one card", you can activate the effect of three different Sangan during your turn if you control them. But if a card says "You can only use this effect of [the monster's name] once per turn" or "You can only activate the effect of a card with this name once per turn" (or something like that), no matter how many different copies of a card you control, if they all have the same name, you can only activate one of them.
In your case, because Ghostrick Skeleton has that restriction, only the first one to be flipped up would activate its effect.
---
So, with the 1.5x EXP and spending 15 Genex Icons (or whatever the Event currency is called) against Lv10 Zane, you get up to 2250 EXP per duel, the equivalent of a Vagabond and still has a (small) chance of dropping SR packs and Gems. I just read about that earlier today and I've already gotten more gems this way than what I got from the Gladiator event...
