Titanium is expensive because it takes so much energy to separate the Titanium from the Oxygen, when it is refined from Titanium Dioxide ore.
It is also extremely reactive in a pure state, and will even burn like magnesium or zirconium when stretched into thin ribbons. All refining has to be done under deep vacuum or inert atmosphere.
The most common Ti alloy found is 6AL4V, because it is used for structural components in aircraft and because the Solviet Union dumped mega tons of it on the market as scrap, when they decommissioned their submarine fleet. It is 6% Aluminum and 4% Vanadium, with the balance CP Ti.
The most expensive and rare Ti on the market, is Commercially Pure, or CP, because it is made from ore and there is very little scrap available.
Grade 2 CP Titanium is what the good nails and skillets are made of. They have no alpha case as received and it is up to the buyer to build one, before using. You can use it as is, but you will definitely taste the Titanium.
We season a nail or skillet, by heating it in the atmosphere to incandescent and letting the Nitrogen and Oxygen in the air build a nitrite and oxide layer, which is highly inert.
As you heat it, it first turns golden, because Nitrogen is the most common gas in the atmosphere, and Titanium Nitrites are golden. Observable Titanium Nitrites start to form at about 100 parts per millionth atmospheric contamination when heated.
There is less oxygen in the atmosphere, so the Oxygen colors come in after the golden after the 100 ppm level, and form reds, blues, and finally grey colors.
Once you have reach grey, the Titanium is no longer reactive.
You can also coat the nail or skillet with cannabis oil and burn it off, to form Titanium Carbides, which will also tie up the Titanium atom in a stable non reactive state.
The Titanium nail or skillet should outlast its owner. It won't if you regularly clean the nail with acid, as that removes the surface and eventually there won't be any left. I recommend just brushing it off.
The acids used to chemically mill Titanium, are a Nitric/Hydrofluoric Acid mixture. Around 10% HN03, 2.5% HF, some surfactant, and the balance water. Nothing you want to be anywhere around without proper safety gear and ventillation, as HF will even dissolve glass.