My inlaws got a $5k massage chair, bought that I believe in 2010, yes, it was already that expensive back in the day...
I love using it because it feels expensive, and I felt rich for a bit LOL no joke though it feels good for the lower back and upper legs...
Honest opinion? Good sports massage therapist in Sydney Aus cost around $100 per hour, and going there twice a month for maintenance and injury rehab is more than enough, so, I going to great sports massage therapist would cost us like $200 per month, $2000 ish per year, and that, if we go 20 times a year, if we get ourselves a massage from certified sports therapist just once a month or 10-12 times a year, it's gonna cost us $1200 a year, $5k is around 4 years proper muscle theraphy.
That being said unless you are buying one that cost more than $10k today, you are wasting your money, seriously. I do believe the one that will do proper job like the one my inlaws have will cost roughly $8k MINIMUM these days.