Virtual HTML Display as BBCODE for OT messages

I have this idea: use the Virtual HTML Display as BBCODE for example to tag OT messages.
Do you think it is possible?
Something like:

Code:

<!--VBSEO_VIRTUAL_HTML-->
{param}
<!--/VBSEO_VIRTUAL_HTML-->

I don't think that is a good idea

Why not?
In this way the text OT will not reduce SEO.