Most cars (not all) I’ve seen in the showrooms are non-performance trims.
And adding $5K option on top of P pricing is likely not going to increase that proportion of sales either. People who weren’t interested in 3P is not going to now buy it because it costs $5K more.
The incremental benefit to Track Mode V2 is not increasing the revenue or margin for M3. The benefit is in showing (again) just how advanced Tesla's software and engineering capability is over OEMs. The auto magazines will love it and that shine will rub off on reviews of other Tesla variants and models. Likewise track enthusiasts putting up YT videos that will be watched by lots of potential customers for less high performance EVs. TM V.2 is just the latest example of Tesla's belief that making insanely great cars is the best and cheapest advertising.