Indeed, a recent Bitcoin conference stopped receiving payment in Bitcoin because of the cost and time involved in processing the payments.4 Bitcoin is far inferior to existing payment options. Bitcoin transactions generally require confirmation from six miners. With each block taking around ten minutes to mine, you would expect transactions to take an hour to process.
But with recent network congestion, the average time for one confirmation can easily exceed several hours. At these speeds, if you bought a bunch of tulips with Bitcoin they may well have wilted by the time the transaction was confirmed.5 Bitcoin payments are also expensive.