In 2019, when mining became non-profitable, the network hash rate decreased from 300 terahesh to 150, then many good video cards were sold for $ 150-200, for example AMD Vega 56 and Vega 64. Check how much these video cards cost now.
We must be ready for a new sale of video cards.
Yes have some cash/credit ready for cheap cards.
But if you want to add a few at premium now It is okay.
It differs for each of us.
I have cheap power to spare and could add 100 cards today actually 300 cards. With some simple but not cheap circuits added.
I have 5 x 30 amp 240 volt circuits empty they can do 2x 12 cards rigs. or 24 cards x 5 = 120 ready as I type.
we could add 12 circuits that means 24 x 12 = 288 with additional circuits and more cooling.
With this in mind. I slowly add minerdude cases and rtx a4000 cards.
if they were cheaper I would buy quicker.
but I pay 1200 a card and 1000 for the rig total of 12x1200= 14400+1000 which is 15400 a rig
I feel a true price for this rig is less maybe 700 x 1200 = 8400 + 600 which is 9000 a rig
now to buy rigs at 15400 when I think they are worth 9000 is okay if I buy slowly. Keeping cash in reserve for a crash down to the lower prices.
We can add a rig a month at the 15400 price