Recent market studies reveal that IPv4 has a remarkable increase in its price - a fact due to a rapid growth of demand and a reducing amount of supply. The transaction of IPv4 in the market and RIR transfers has observed a significant reduction in recent years.
Such condition necessarily increases the price of IPv4. Additionally, The American Registry for Internet Numbers (ARIN) reveals a list of the companies who are looking for free IPs from ARIN when the organisation receives Its from IANA. However, under current condition, the companies will also be on the waiting list - as it is very unlikely for ARIN to receive any free IPs from IANAs. It seems that the only way for them to get IPs is the market.