You spend hours and hours getting lots of platinum coins.
After lots of work you happily go over to the shop.
You see just what you want so you quickly snap it up.
There goes all your money but now you have the spellbook youve been after for weeks.
You read the book....
"You failed to learn the spell"
AAAAAAAAAAAAHHHHHHHHHHHHHHHHHHHHHHHHH
Once youve finished screaming you are then depressed and feel you have completely wasted your time.