But this ebay CPUs are really not cheap. Actually I need at least 100 PCS Celeron G4930 for Biostar TB360-BTC PRO (it support only 8 and 9th gen.)
Several weeks ago my buying price was around 31 USD (BOX, new, 3 year warranty). But now no stock, and all Intel distributors tell me, that Intel is not able to deliver them...
You used to buy processors for $ 31, now you have to pay $ 100. You will pay 69 more - this is an extra expense. But 1 mining farm of 6 video cards gives a profit of $ 15 per day (I counted not the most profitable video card - $ 2.5 per day)
This means that in 5 days of mining, you recoup the costs.
I think it is worth buying more expensive processors in order not to lose profit.