KQ collection... I like the idea, but I hate King's Quest. I suppose, I'll pass.
GOG has those too, actually.
Not for $5 for 1-7, that'd cost around $25 here (probably $12,50 with a sale).
However, from the looks of it the Steam versions might need some manual tweaking depending on your OS (doable though), whereas the Gog's probably work straight out of the box. Just up to each to see if that's worth the price difference.