hm....on the one hand you complain dmoz drowns in work as there are too many site to review, not enough editors,...
Actually, no, we don't complain about that. Non-editors do.
... but on the other hand you do not want to invest in a better or more complex organizational structure. Sooner or later you will have expenses...
Our organizational structure is fairly complex -- adding pay-to-list options would create to a logistical nightware without actually adding anything of any real benefit to the directory.
Imagine you would employ some people full time, they could have an eye a bit better and maybe help to make things move into the right direction.
We already have editors that do that. Admins and metas and editalls...
And why not "make" people edit some categories more then others once in a while to balance the pending queueus?
Because we won't. And because the pool of unreviewed sites is not and never has been our biggest priority.
there are many non-profit organizations run by voluntary people who can not always just do what they like but what is in the interested of the whole organization.
Exactly. Which is how the ODP functions now.
you could develop your software so that some sort of "managers" can have an influence on handling the queues of unreviews sites and allocate the work more evenly....just as an example.
There is no "work" to be allocated. Editors are limited only by their desires. If someone desperately wants to edit a given category, they will do it -- if they don't have the experience now, they'll work their way up to it. They don't need a software overlord to tell them where to edit.
it is clear that this must avoid a yahoo like behaviour where the quality of results suffers due to a dependence on "premium" website submitters.......
And how would that be avoided? The minute you introduce fees, you're putting the quality in the hands of the people who can pay.
I'm always surprised by people who think that (a) paying a few editors would result in more editing being done than is being done by thousands of volunteer ones and (b) paying for a listing will result in more relevant listings.