Grandcoin pays a grand, that's why it's called Grandcoin. Nothing will change and there's nothing wrong with it.
The price is down 99.5% and quickly heading to zero.
Depends what you take as being 100%. If you take a top of 1000 sat yes then it's down 99%, if you take a bottom 18 nov 2013 it was 3 sat and it would be up 400%

I guess you just gotto wait for the next bullride. Stock up now and hold longterm, perhaps there will be new all-time-highs again above 2000 sat, no one knows, all altcoins are bottoming.
I totally agree with you. The thing is, most coins that we're developed at the same period as GrandCoin have died. GrandCoin obviously hasn't yet. Sure, the value is way less than it was before, but, I think we had to deal with a pump at the ATH of GrandCoin. But, the walllet is still working great. Most of the wallets of coins that are as old (/young) as Grandcoin aren't even working anymore. Even many younger coins have died.
FYI, I'm still collecting more and more GrandCoins. I think because I still believe in its future. If I'm wrong, I've lost my investments and i've got to deal with the loss, but I still have confidence in this coin.