Hi all!
Yes I would, and have, leased servers with no control panel.
The most recent one is Redhat 7.2.
I installed Webmin/Usermin.
It all depends on a persons needs and skill level as well as the cost.
The plain RedHat 7.2 server hosts a single domain with a large Vbulletin forum.
The client knows nothing about servers or software and I manage the server for him so I saw no need to pay for a control panel.
I also have an Ensim3 . 2 server.
The Ensim box hosts several domains that the owners want a control panel for.
I have had a lot more problems with the servers I leased with control panels then the ones without.
I have used WHM/Cpanel, Ensim 3.1, Ensim 3.2 and Webmin.
Webmin is my personal first choice.
Mainly because it is easy to install and use, and its free.
Most of the commercial control panels are too complex and proprietary.
RedHat, Apache, MySQL, PHP, etc. all work fine set up the standard way.
The commercial control panels lock you into using their versions of everything.
Try to upgrade things using the standard RPM's and you might have big problems.
Thats my 20 cents worth ;-)