You could switch back and forth between skills though... so as long as a skill is useful in certain situations, it's worth having. And I agree, 500 gems is surprisingly few considering fragments can be sold for 50 gems each.
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you can switch between the skills? as in "during banish i want driving blow and later on i will do HR with sweeping slash", or you are saying that if he ever gets a skill scroll again he would be able to over write the other? (as you can easily tell i have no clue about them since i didnt get lucky enough to aquire one).
After 'using' the scroll there is indeed a new button in the Heroes window next to the skill attack name that pops open a pane to let you choose which skill attack they will use. Thanks for that info. :)