Hi Rikki,
You're right, I'm sure there are those who will hand over a wad of cash just because some slick sales guy gave them the old waffle. I've trusted my ears for nigh on fifty years in this game and they've never let me down yet. I don't take anyone else's opinion - that's all it is, someone else's opinion. I buy and play what's right for me.
The people who do find value in these reviews are probably those with no prior experience of keyboards and, as such, reviews do have some value to them. Sales reps naturally will try to sway them to their own particular brand, but there's no substitute for one's own ears, and new buyers should pay attention their own.
I mean, you wouldn't buy a perfume just because someone else told you it was wonderful. Same with keyboards.
Nigel, you're on the money, too.