If I would have a commercial business, I would not put backlinks in Wiki Sandboxes. Not because it's evil, but because it's not a very serious business strategy.

Is completely rational. Spending valuable time horsing about in wiki sandboxes installing links that any wiki owner will have automatically deleted every few hours anyway, is not a serious strategy.

If there was any chance they would be permanent, such as in automated guestbook links back, it might have some value, but even then, there is little guarantee of the kind of permanence that a serious business needs.

Building better content, setting up bona fide relationships, or contributing something of value to another site, attached to your link, are better uses of the available resources.

BTW, this board hates Opera.