Yes, I agree with you, I never said I thought it was a good idea. Disinflating or deflating the value of gold is good for players who already have a lot of gold. Stat inflation (or more seriously, modifier inflation) is a separate but related issue, but I feel like I would reserve judgment in that regard until we see the prizes for the next few events. I agree with for instance, increasing the modifiers on the war prizes, but only because of the massive modifiers GREE was handing out for relatively cheaply recently (e.g. Victor Klaus boss, map boss LTQ). The 30% car attack/defense modifier was also a terrible idea, for what it's worth. Most of the players who are going to get that ridiculously huge modifier (equivalent to multiple wars' worth of prizes) will do so by either abusing the matching system, or beating other players also hoping to abuse the matching system, or by already being the game's top spenders anyway-- e.g. FC and SAS.
If they continue to hand out massive modifiers in every other event, I will agree that this is a terrible idea. I also agree with you in that they are discouraging competition between FC/SAS and the rest of the CC population, which is probably not the best idea for GREE either. I don't think that GREE is hoping reliable spenders (with large stats) quit so that new spenders can take their place. I could never make such a judgment without seeing GREE's actual spending data, but I would fathom a guess that players who haven't spent much in a mobile phone game before aren't going to be the ones to start spending $5k-$10k per month to catch FC/SAS.
I'm sort of ranting without much cohesion or direction here, but to put it simply, GREE already has quite a mess with stats and modifier inflation, and there is literally no good solution to fixing it. As I said, I'd also be very upset at the changes if I was still in the gold bonus program, but I am pretty sure all the alternatives GREE has to fix stat inflation will hurt some piece of GREE's demographic. I am just hoping that the aforementioned changes are indeed being made for the long-term viability of the game, since most of GREE's other recent moves have seemed like "short-selling" to me.