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I do think that upgrading to the professional edition of Burp can be a great investment. However, like with most other things, it will only be a great investment if you also invest in and dedicate time to learning how Burp works.
Burp does have some overlapping features with some of the automated scanners you’ve mentioned using in the past, but it doesn’t always mean it will completely replace them. Also, automated scanners are there as a tool you can use in addition to your other efforts. What I mean by that is buying Burp pro won’t magically reveal more bugs overnight but it will give you a tool that can help you explore an application, understand how requests are sent back and forth, and try stuff out by intercepting and replaying those requests.
Hope this helps and good luck!!