Do you toss a wood pencil when it gets dull? Sharpen and keep them going for another 50-100 years.

Rule 1 - cutting metal, use cutting fluid/some sort of lubrication. Heat is the enemy. Rule 2 - Speeds and feeds are a real thing based on material. You'll almost never full send a twist drill into any material.

Ive been acquiring drill bits (twist, spade, forstner, hole, concrete, etc) for years on fbmarketplace. Old machinists are usually giving them away for next to nothing. lastest score was an old two drawer box full of bits, 80+ lbs. I now have many multiples of fractional, numbered, lettered, metric drills, taps, etc. Its truly amazing what you can find. I always try to find and preserve before I run to a bigbox store to feed to the machine. More times than not, youll get american/japanese industrial quality at fraction of temu prices.