Junkz would have a huge lead in that case.
If not, then without Cr's, I would assume it would be:
In no particular order, just my guesses.
Well, if http://urdb.kirlad.net/packs.php is to be trusted, it seems to be: (excluding CRs of course)
That would be more so the average price per card... they're good pack choices due to the higher concentration of well-priced cards (and lower concentration of absolute rubbish). But the OVERALL most expensive clan is a different story, I believe.
Any guess I make isn't likely to be accurate, so I'll let someone with the actual data to enlighten us.
If you take into consideration Crs any clan with a big 5 Cr in it would be the most expensive.
Are we forgetting Jungo? Jungo has 800 clintz cards on the FIRST PAGE. Same with Freaks