The problem is that most tank raised clowns these days are outright garbage (deformities wise) and the last thing I would want is to create more of those. ORA is IMO one of the biggest offenders, I have not seen a single decent looking clownfish from them around here in the stores. Though others seem to be not much better
Add to that the designer clown castoffs that are often sold as "true percula", if not by the breeder then by uneducated or outright dishonest store personal.
If you want to breed fish that can be used as a reservoir or next generation broodstook you need fish of high quality and that haven't been tinkered with.
That pretty much only leaves wild caught of known origin.
I also don't think there is too much wild harvesting going on anymore as most clowns sold today are designer clowns and locally bred ones by hobbyists.
It is actually quite hard to find any wild clowns in stores (at least around here).
And in the wild they are by no means better of - see here:
http://www.cathychurch.com/index.php/kissing-crowls
So I really don't get your point.