Not only to charge what you're worth...but to ensure you're protected in the event of workplace accidents/injuries/illnesses...which in some cases last long after the weekly reimbursement for the work performed has been spent...
Imagine losing a lifetime worth of income...after being permanently injured while performing a ''fills and favors'' job...for which you were not eligible for accident/injury/illness compensation...
Yes - that is an extremely important point and why I'm so specific about the details on this.
Anyone not working as a fully paperworked 'employee' owes it to themselves to do a good bit of research on their exact standing.
In some places you may have to take a calculated risk as the laws are not worker friendly - but it's important some effort is put into doing that math accurately.
I'm a big fan of Alberta's system (despite being a payer rather than beneficiary) in that it all but ensures universal coverage and puts the burden of proof on the 'next guy up the chain' as to whether they are responsible. Basically, if you don't have a 'WCB clearance' provided by the government from someone you contract (individual or business) you have to assume you are the one paying for their insurance and will be legally responsible if there is an injury. I generally hire freelancers on a hourly/daily basis - I pay WCB for almost all of them. The system is really simple to be a part of and a small financial burden eliminates a large administrative burden.
(To make this relevant to diving... I believe BC's system is pretty closely aligned with Alberta's)
you do not have to be covered under the owners WSIB you can be a sub contractor then the WSIB is on you ...... the employer still has some obligations but its limited .some one who has worked for other people all their lives AND never been a 'dive professional " wouldn't know that as some one who has owned 2 dive shops and a chrome plating facility for over 20 years I HAVE employed sub contractors in all the business's
Again, this is very location specific. Based on 'WSIB' I'm assuming Ontario for you. Your experiences are not necessarily applicable across the country and certainly not across NA or the world.
This isn’t an employment law classification, it’s more cultural in origin.
In several parts of Canada (phrased carefully due to my previous posts

) one area where 'professional' actually does exist in the law is for a 'Professional Engineer' - as opposed to a train engineer or a building engineer or an audio engineer. Now, this is partly a valid attempt to ensure the safety of the public and partly gatekeeping on the part of those with that occupation - but, nonetheless, it is an example where the term has actually been defined legally.
However, outside of that, I agree that the phrase is very much subject to cultural interpretation.
Calling someone a 'dive professional' is nothing more than marketing.
The venn-diagram of people who are good at their jobs and people whose business cards say 'professional' doesn't necessarily have a large area of overlap.