Just wiped out my lingots in the store.
I had around 230 lingots and I just bought all the Christmas, idioms and flirting words. Now, I have about 14. Haha. It's definitely worth it, though. Amazing.
First time I spent any ingots and I thought the bonus skills were well worth the price -- especially the hilarious (don't use these lines in real life) flirting section. I still have more than 700 useless lingots ready to spend if they Duo has more entertainment up their sleeve. :-)
I just bought the christmas lessons I still have 675 lingots though...
If you buy them for all of the languages, it's 275 lingots. So either you had 950, or you bought them only for one or two languages.
It's like 55 for each language if you bought all three lessons, yeah. I also bought those cute Coach Duo outfits today, too.