Helping the DIYer is their marketing strategy for one reason and one reason alone, they don't need to market to us at all. They have the supply, we have the demand. What's the point in heavily marketing to someone who's already a captive audience? We are their bottom line, their bread and butter.
Guess who I buy parts from... Just take a guess... If you guessed the supplier who can get me a quality the part in the quickest amount of time, you'd be 100% correct. Take politics out of the equation. It's a losing battle and it's pointless to argue about.
And if it weren't for the parts houses loaning out tools, I wouldn't be where I am today. For better or worse... And my brother, who's an excellent parts changer but has never worked in a shop and couldn't afford to get his car fixed in one if his life depended on it, would be out a car and unable to make it to his actual job.
The DIYer is always going to be there. The DIYer is what every single one of us was before deciding we wanted to make a career out of this crap. If a few random people doing their own work is seriously hurting your bottom line, your bottom line was too thin in the first place.