SMBs are serious business
darkduck correctly wrote QuickBooks is for SMBs and big companies use SAP. There are a lot of SMBs, and they need QuickBooks. Intuit offers QuickBooks Online, but at least one accountant says it's inadequate and he requires his clients to use locally installed QuickBooks. Larger companies have more options, but QuickBooks is a deal breaker for SMBs and Linux.