First, you commented that Wizards require thinking "chess". Are you saying other classes do not require the players to think - they just sit down and roll dice because they don't have to play the "chess". Places a greater burden on Wizards and magic use, which is why I cannot find players that play them.
I am trying real hard to understand what you're saying here.
I am not succeeding, but I am trying.
You realize spell focuses aren't consumed in the casting right?
Wizards are hardly facing any worse money sink that say a melee character who needs armor and weapons constantly upgrading. Especially when the wizard can... just not use high focus cost spells. Fireballs is free.
You realize... spell components that have a cost cannot be replaced by a spell focus. And they are consumed depending on the spell.
Here is the part that people don't read in the magic section:
Material (M)
Casting some spells requires particular objects, specified in parentheses in the component entry. A character can use a
component pouch or a
spellcasting focus (found in “
Equipment”) in place of the components specified for a spell.
But if a cost is indicated for a component, a character must have that specific component before he or she can cast the spell.
If a spell states that a material component is consumed by the spell, the caster must provide this component for each casting of the spell. A spellcaster must have a hand free to access a spell's material components -- or to hold a spellcasting focus -- but it can be the same hand that he or she uses to perform somatic components.
Thus, Wizards do suffer a cost sink compared to other classes. The higher levels require ore components that are consumed.
In addition, learning a new spell in between levels costs additional money. The fighter buys a two-handed sword: 50 gp. But it lasts the whole time. Wizard need Identify, Chromatic Orb - $150 plus $100 if they took 6 other spells to start that did not cost money to start - but another cost each time they learn a new spell. Cost the Soceror, again, nothing for Chaos Bolt.
Fighter: Start with no cost. Can always hit for 1d8
Wizard: Does not start with a 50gp diamon, 100gp pearl to cast spells.
In 30+ years, the cost sink has always been the nerf and curve of the Wizard. Everything else is hard.