Lv10 SP pots are cheaper when you buy it from the market. I spend about 25k on pots everyday. That’s not too bad imo. Buying from market is cheaper than buying from NPC, and the pots from NPC recover less. Don’t worry too much about the SP consumption.
Just to give you an idea how I use my SP.
I am the type that just spam my skills as soon as cooldown is over.
Joint Penalty - 90sp, cd 22s, usually every 30s I will use it
Hangman’s Knot - 67sp, cd 15s, I use it 80% of the time after JP.
Quick Cast - 53sp, cd 15s, i keep it up 100% in combat
Magic Missile - 39spx2, cd 17s, i use it when there are 3 enemies or above
Sleep - sp 65, cd 25s, I use it when peltasa pull a big group and needs some CC
Lethargy - sp 66, cd18s, I use it every 30s on boss, or to help the tank reduce some damage
Summon Familiar - sp 105(lv6), cd 35s, I keep it up as much as i can
Summon Servant - sp 99, cd 60s, I use it every 2-3 mins depending on situation.
Summoning - sp 117, cd 60s, start of combat or when travelling far distance with party
Hold - sp 38, cd 3s, start of every group engagement
Riding - sp 40. cd 30s, used quite occasionally to use templeshooter skill for big groups or boss
Typically, I use about 15 lvl10 sp potion (about 7.5k) per 20 mins dungeon (lvl 190). That’s not right ?