Michael Saylor responded to discussions about Strategy potentially selling BTC in an interview with Bonnie Blockchain.
He stated that a more accurate statement would be: Never be a net seller of Bitcoin. According to him, even if Strategy sells 1 BTC to pay dividends, it is still a net buyer of Bitcoin as long as it simultaneously buys 10 to 20 BTC.
He also mentioned that STRC is an important tool for the company to increase its BTC holdings, and as long as the relevant financing is sufficient to cover dividend payments, Strategy can continue to maintain its status as a net buyer of Bitcoin.

