Is it worth to give 90$ for three letter com domain?

Bjorn is right.

Well i would use it for wordpress MU(massive blog install)so that's way i need short domain

3 Letters, or 3 characters?

If it's 3 letters, i'd say go for it.

where did you see them for $90 ?

depends... sex.com is three letters... but so ywj.com....

where are these 3 letter domains at?

I'll inspect them for you

It would probably fall in the range of these recent sales...
pwx.com $1,500
wxq.com $2,256
cxa.com $3,600
opx.com $4,101
exu.com $4,600

so yes it's worth 90 bucks

yes, it it's sex.com

here is list:
1j7.com - 3 $86 3H 41M [Expired Name. Bid on 1j7.com]
1j4.com - 2 $83 3H 41M [Expired Name. Bid on 1j4.com]
1j0.com - 2 $92 3H 41M [Expired Name. Bid on 1j0.com]
1i6.com - 3 $87 3H 41M [Expired Name. Bid on 1i6.com]
1h5.com - 3 $91 3H 41M [Expired Name. Bid on 1h5.com]
1h6.com - 3 $81 3H 41M [Expired Name. Bid on 1h6.com]
1g9.com - 5 $90 3H 41M [Expired Name. Bid on 1g9.com]
1f9.com - 5 $85 3H 41M [Expired Name. Bid on 1f9.com]
1f7.com - 6 $90 3H 41M [Expired Name. Bid on 1f7.com]
1f6.com - 3 $90 3H 41M [Expired Name. Bid on 1f6.com]
1f5.com - 3 $89 3H 41M [Expired Name. Bid on 1f5.com]
1f0.com - 2 $76 3H 41M [Expired Name. Bid on 1f0.com]
1d9.com - 4 $96 3H 41M [Expired Name. Bid on 1d9.com]
1d7.com - 3 $91 3H 41M [Expired Name. Bid on 1d7.com]
1d5.com - 4 $91 3H 41M [Expired Name. Bid on 1d5.com]
1c5.com - 3 $100 3H 41M [Expired Name. Bid on 1c5.com]
0zw.com - 4 $84 3H 41M [Expired Name. Bid on 0zw.com]
0zv.com - 4 $87 3H 41M [Expired Name. Bid on 0zv.com]
0zt.com - 2 $100 3H 41M [Expired Name. Bid on 0zt.com]
0zq.com 43 5 $99 3H 41M [Expired Name. Bid on 0zq.com]
0zp.com - 3 $107 3H 42M [Expired Name. Bid on 0zp.com]
0zl.com - 2 $106 3H 42M [Expired Name. Bid on 0zl.com]
0zj.com - 3 $83 3H 42M [Expired Name. Bid on 0zj.com]
0zh.com - 2 $98 3H 42M [Expired Name. Bid on 0zh.com]
0zg.com - 4 $98 3H 42M [Expired Name. Bid on 0zg.com]
0zf.com - 5 $82 3H 42M [Expired Name. Bid on 0zf.com]
0zd.com - 4 $83 3H 42M [Expired Name. Bid on 0zd.com]
0zc.com - 3 $101 3H 42M [Expired Name. Bid on 0zc.com]
0zb.com - 5 $98 3H 42M [Expired Name. Bid on 0zb.com]
0z8.com 24 3 $88 3H 42M [Expired Name. Bid on 0z8.com]
0z6.com - 3 $82 3H 42M [Expired Name. Bid on 0z6.com]
0z5.com - 3 $83 3H 42M [Expired Name. Bid on 0z5.com]
0z4.com - 3 $84 3H 42M [Expired Name. Bid on 0z4.com]
0z2.com - 3 $82 3H 42M [Expired Name. Bid on 0z2.com]
0yx.com - 4 $111 3H 42M [Expired Name. Bid on 0yx.com]
0yw.com - 6 $98 3H 42M [Expired Name. Bid on 0yw.com]
0yv.com - 4 $80 3H 42M [Expired Name. Bid on 0yv.com]
0yt.com - 4 $96 3H 42M [Expired Name. Bid on 0yt.com]
0yc.com - 3 $81 3H 42M [Expired Name. Bid on 0yc.com]
0y9.com - 4 $80 3H 42M [Expired Name. Bid on 0y9.com]
1c6.com - 5 $90 3H 44M [Expired Name. Bid on 1c6.com]
0zi.com - 3 $84 3H 45M [Expired Name. Bid on 0zi.com]
0z7.com - 5 $77 3H 45M [Expired Name. Bid on 0z7.com]
yg9.com - - $600 5H 7M [Bid on yg9.com]
5e2.com - - $2,000 15H 7M [Member listed. Make an offer on 5e2.com]
h0o.com - - $2,000 15H 7M [Member listed. Buy h0o.com now, or make an offer]
3ej.com - 7 $116 1D 1H [Expired Name. Bid on 3ej.com]
i9f.com - 6 $105 1D 6H [Bid on i9f.com]
b9w.com - 6 $110 1D 6H [Bid on b9w.com]
u4v.com - - $350 1D 6H

Eventually every 3 letter .com will be worth good money ,
I don't know about 3 character though(meaning contains a number).

As more companies form there will be a company with the 3 letters you have .

Even if ABC was not a broadcast company and never bought their name, the ABC store chain in Hawaii still would have paid at least 100k for abc.com

One day somebody's going to need it.

Well they are worthless in terms of people remembering them. The other side of the coin is SE traffic which wont care if its a short name. Try getting a 4 character one that is pronouncable instead seeing as they can be had for the reg fee.

3 letters

Those suck. No they are not worth it.

stop saying 3 letters when it's 3 characters man

Yes i know,my mistake

Not worth it; people will have a hard time remembering it anyway.

3 letters is soooo different than 3 characters
lol thats like comparing a lambo and a kia

just forget about it

Perhaps i could take three letter biz domain,i think that is still avaible.

waste of money

Not good..