I do this too but I generally search on google/amazon for the product before buying. Much of the time, the same product is available cheaper from someone else. I think certain companies buy and resell stuff through paid advertising, so they have to pad their margins appropriately.

I bought some sensors that Instagram advertised to improve ski technique and they’ve worked wonders

If you don’t mind me asking, can you please share a product name or link? Sounds cool

As the other poster said, it’s Carv (https://getcarv.com/) . It has helped me a lot to improve technique, I actually learned how to carv in skis, and I’m much more comfortable when going fast (my speed record is now 105 km/hr) . It’s beautiful having objective data to tell if you have improved and what did you improve, as well as what needs more work. For me it was a cheap buy as a private lesson one whole day would go for the price of the device, which I can use the whole season and gives me objective data. Stomp it tutorials in YouTube is also a big help.

Thanks!

Looks like it's called Carv, here's a link: https://letmegooglethat.com/?q=skiing+sensor+improve+techniq...

Thanks!