Not sure if this is the right place to post this. Also because, in my view, it is not simply system-wise but also rp-wise.
Gilding is quite a pointless craft to pursue, if one is not stubbornly and patiently ICly related to it. The first level is got, as other crafts, after the fisrt fail, but the first thing you may do is set DC 20, thus, with the -5 penalty for the "new recipe", and unless you have some +4 (constitution and intelligence), you are doomed to waste the 1st level only with failures. My own case is +3, so wasting my first level as such. What I've noticed is that I earn 4 cxps for each failure, which means one piece of acid (some 10-12 coins) and one of mercuery (290-310). Let's put it in the lowest range, it means 300 coins each fail for 4 cxps, and you need 1000 cxps for having the chance to gild anything with a natural 20. It means 250 attempts, so 75,000 coins. Adding to this, silver is not really something you find at every corner, the usual place where you can get it requires a well planned party. And even if one wanted to sell gilded weapons, they are not magical, they serve only vs werecreatures, if you are used to deal with a party with someone able to cast, or even if you're able to cast (magic weapon, lev 1 spell), you'd need just a steel weapon. Money sink? Maybe, but I'm sure not many these days are going after this craft, personally I went to cxps 750 and put a lot of effort in it. Maybe, actually, the gilding system needs a serious revision.