You're not the only one complaining and SPG are not the only hotels with this kind of problems...
Once I only had 2 plugs... one near the entrance for the vacuum cleaner probably and one at the desk.
What we really need is a plug behind the night stand. I'm sure I'm not the only one who uses his mobile phone as alarm clock and I like to have it plugged overnight so that when I leave in the morning for my next flight, it's fully charged.