Interesting few posts above. I'd be very surprised if Cent were willing to match the MR earning bonuses that the Gold card attract. If they did it would be a great thing. Like JK I actually use a Gold card (my wife's that I enrolled when I joined Cent) for a lot of the travel spend so I can attract the bonuses.
One of the biggest pluses for me though would be if they waived the foreign currency charges. When I had the initial cent invitation this was one of the questions I asked and was told that something was 'in the works'. This would save me the yearly fee at least if they introduced this.