preference, placebo

I can't think of a good reason, but a half-assed reason could be to help guys using discus-throwing sensitivity keep their mouse on their glass / plastic pads when making fast movements without having to press down as much.

some gamers possess ogre strength, so that lifting a normal mouse gives the feedback of an average man lifting a crumpled ball of paper.

This. Personally, I prefer my mouse as heavy as I can get. I am a carpenter by day, and sometimes after swinging a 4lb sledge for a few hours, it can be a struggle to make fine movements in quake with a 120g mouse, let alone something like 85g.

Feels a bit more stable, but more straining

The secret to toxic's aim is playing with a 20kg dumbell disguised as a wmo.

IMO because light mouse feels "cheap" to some people, heavy = "strong, good quality".

I would be willing to bet this is the real reason why they end up being purchased in the first place. I definitely associate most heavy electronic devices as being more durable compared to their lighter weight counterparts. The disconnect is that they are weights meant to be removed and cannot in any way affect they durability of the device.

Oil Tanker Simulator 2014.

Do 180s, just as you would in real life!

Must be really great to rape people on Hearts and Reversi.

Nope. Just newbs think friction is good and will buy such things.

Well, you could argue that zero friction could hurt...maybe...im not sure, but im sure that zero friction isnt the best thing as well. I still like my frictionish Fatal1ty mousepad. :)