What's Your Experience with Intentional Wrecking?

Hi All,
I'm seeking your opinion regarding intentional wrecks in iRacing.
I'm interested in getting into sim racing but my biggest reservation is how much I see about poor sports (jerks) deliberately wrecking other drivers. Is this a frequent occurrence? I imagine it depends on the class or license but I'm also curious what it's like at different levels and how high I must climb to escape these people.
It seems like iRacing is reluctant to enforce bans and allows people to defend wildly, ignore blue flags, drive backwards, and otherwise ruin the racing experience for everyone else. I can't justify spending $4k+ and my time on something that is only going to be a source of frustration.
Thank you for your input!

*Added note - thank you for everyone's input! This is terrific and helpful.
For anyone giving input on the stated budget of $4k, it's not the main subject of interest since everyone has their own budget, but I appreciate the feedback. I'm starting from virtually nothing so there is a steeper barrier to entry.
PC capable of running triples (i7 + 4070 super) - $1550
Monitors - $200 x 3
DD Wheel/Pedal - $650 +/-
Cockpit + stand - $800 +/-
iRacing - $150 +
Misc + ?