Well they aren't getting more valuable, thus you should have asked up around 1m. I'd be burning these things until I hit around 500-600k to keep around. I'm sure you travel on airlines, so transfer to your program of choice, or better yet wait for multipliers for hotel to air conversions that some programs offer sporadically (AA/BA, etc.).

Also you can get any hotel rooms you want for quite a while, but please don't sit on these any longer.