Every time I see this skip reward I straight up ignore it, unless I have JJ joker (which I rarely do), that benefits only slightly from the free reroll. I think that if the next 2 rerolls are free, than it would be worth more.
Probably the only time that's wise to go for this skip reward is when you have the overstock voucher maxed out and is in need of a better joker, otherwise, it's useless.