I think they are suspicious, but not malicious. IMO, the most likely situation is somebody that really thinks GDQ is great (and perhaps part of the board/administrators) will donate from their own money, but will drip-feed it to encourage other donations
I only bought it because I enjoy me some HexCells. There's a few decent head-scratchers and you can fully knowledge things out, but brute-forcing it is a rather effective method