Still a fridge always full of good food is a perk that's comparably hard to get by oneself. There's still the question whether it is desirable (getting fat is a real problem) but the point remains: some perks can be much more effectively provided by the employer.

On the other hand I hate all kinds of the mandatory fun activities at work. These work as antiperks for me.

Or both, or the company allows employees to reimburse their own ergonomic chair purchase. I actually prefer the latter if I can't find one I like from whatever the office provides.