I purchased a software called ExpressInvoice.
Basically it generates professional invoices and quotation.
While this might not be important for personal services like weddings, it makes a hugh different when dealing with corporations works. It may also mean whether you can get your AR faster or later.
Like one of the bros here mentioned, if you are taking photography as a profession, cashflow is very important.
It's also easier if you are a registered entity with ACRA and needs to report your earning for the year. It gives you a piece of mind that your records are in place, in case someone requires some verification.
Whereas MYBO is good, it may flex its muscles when you are making alot of money say $100K per year and have expenses such as salary for your employees, GST etc.
I think most of us has a foundation in basic accounting while we are at school. So if one is running a one man show currently with help from part timers, then we have to value the cost of the accounting software vs earnings. If you ask a professional, they will tell you the very best they know but not necessary something which you need. They have to know these to impress. But ultimately running a business is alot of work. Same in the photography business, if you want to run it well, you have to know more than just the act itself.
Hope this helps.