My Sabatiers with CS blades, all have silver and not gold colored rivets (EDIT) and all have been used since the '70s. The blades are pitted both from the pouring of the metal and use over the decades.
The tin can flake off and rust appears. And replating tin is nowadays very expensive. If you're going the 30X a year use, then spend the extra $$'s to get something that won't need replacing and that means spending $75+.