Speculators believe the value will go up, so they buy and hold the asset. Each individual's timeline will vary, some will hold for a few days, some will hold for years or forever. But ultimately the price is determined by buyer demand and supply (or lack thereof).
Coin prices are high relative to its recent past. At $1k people though Bitcoin was expensive. $5k, $10k, $15k, same thing. We won't know what the true price is until we the bubble pops and the mania stops.