Cant agree more, cost vs profit is always going to be the issue. Cant speak for Winchester but the CZ is a cast action, it has very few upgrades since the ZKK action was first buildt to its current 550 action, main diffrance is in the trigger assembly and mounting. Their cast mold is getting pretty old and it can be seen in the rough edges and not so sharp lines in and outside the action. What was a standard polish procedure years ago just does not cut it anylonger.
One main advantage the M70 has as far as feeding is concerned is that Winchester coned the breach, this helps the bullet slide into the chamber, CZ has a flat chamber entrance making feeding straight down the centre more critical.