OK, here is my experience and I have to WARN you!
You will have to buy much more points then you really need!
I started with only 13 FP (funcom points) and 400 BP (bonus points). I bought 600 FP but the shop still says: 2700 FP are required for the "Kassette der Nichtigkeit" (German for coffer of nullity). There was no sign to UNLOCK.
Picture 1
So I bought more points until I had enough to buy the "coffer of nullity" again (you can see it in the right bottom corner). But still there is no sign to pay more points for unlock something.
Picture 2
With the last step I bought more points and NOW the info is revealed to unlock the item.
Picture 3
And now, at the end, here comes the joke: I only paid the DIFFERENCE, beginning with the bonus points!
Now, I still do have 3338 Points!
I started with 13+400, bought 3600 and had 3613+400 Points. I paid 675 and now still have 3338 FP, which means the bonuspoints were paid first and then I only should have to pay 275 Points but I had to buy 3600!
Funcom: thats not fair!
Next thing is: Why dont you show the "UNLOCK" button at the beginning? I will never, NEVER know, which Items I can unlock until I buy Thousands of FP!
Funcom: Thats not clever!