They would be able to buy cheap Bitcoin but if we're in a bear market they can't sell for huge profits (and then rinse and repeat) until the next bull run. Or is Bitcoin accumulation the be all end all for them?
Money is power, and if you have money (fiat) and enough BTC you can definitely influence the crypto market and direct it where you want. If you look at the last few days, the price ranges between $30 000 and $40 000 - and some certainly profit from that because they sell near the upper limit, break the price and then buy as close as possible to the lower limit.
When you talk about big profits, you should know that this is not about someone selling or buying 0.02 BTC or similar, but that this is also about real whales that have hundreds or thousands of BTC - so the calculation would be something like this :
- sell 100 BTC at $40 000
- buy 100 BTC at $30 000
- profit = $10 000 per 1 BTC = $1 000 000
In short, do this only once, and you still have 100 BTC and $1 million in profit minus taxes of course.