Impeesa
Explorer
The rules as I read them are pretty straightforward - regardless of whether the abilities are similar or not, any item that takes up one of your precious slots uses the 1x - 1.5x - 1.5x (etc) price structure. The 'similar abilities' pricing is intended for things like a staff with multiple spells on a similar theme (for example). You could make a buff item like this slotless, in which case the abilities would be considered similar (protection-related), and the pricing would go 1x - .75x - .5x - .5x, or (after applying the x2 slotless modifier) 2x - 1.5x - 1x - 1x.
--Impeesa--
--Impeesa--