How many pair of speakers do you own?

Thanks you so much for the quick respnses, my next question would be why you would own more than 2 pairs of speakers such as one for Stereo and one for HomeTheater (5 or 6)

1) Because you feel the urge to keep hearing others
2) You are still looking for Audio Nirvana
3) You have a large sum of money
4) You write reviews and get them free
5) They are very good for furniture

8 pairs. One pair of floorstanders, the rest are monitors. All are in use at various times.
Another pair on the way.

Because I have more than one room in my house......

at last count 7...reason? for fun. listed by size:
JBL L-200
JBL L-166
AR 11
Epicure 10
Spica TC-50
Chario Academy 1
Ensemble Animata

To answer your second question, none of your suggested answers applies.

In my case, (1) when I upgrade, I don't get rid of the old equipment -- they usually just get reallocated to other rooms; and (2) I think it's nice to be able to listen to good music reproduction in different rooms especially when it is also consistent with the decor. Do you have children? Are they into music? Should they have their own stereos, too?

Of my 8 pairs + 1, 2 pairs + 1 center channel are in my main system, which is both my best stereo and home theater system, and 4 pairs are in stereo systems in other rooms. (2 pairs are in storage.)