yes except that blessed orbs have the most variation in value. Some ppl claim they are pretty abundant and value them much lower as in that table.
Exalted orbs, GCP, Chaos are the three most common used orbs for payment. Sicne these are the three most wanted orbs in this early stage of the game. I expect alterations to become much more wanted in some time due to the need in maps rerolling and endgame crafting. And GCP to lose its value when everyone has his maingems at 20% quality.
1. get an ilvl 74 item>roll 100 alterations until you got the perfect magic item
2. regal it to hope for perfect 3rd affix, then if failed use scouring and go back to step 1.
3. if succesfull, use exalted orbs, if these suck, scouring and back to step 1.
4. if succesfull>finished.
Blessed orbs are completely unneeded in this endgamecrafting, since you would only start step 1 with an item that alllready has perfect implicit stats.