In my personal opinion, these domains dropped because the owner realized that they had no value.
That's the case with most drops. These probably would have had some value 5 years ago but the Internet is changing. Facebook and Google now run the show. The gold rush for websites is over and now there is a ridiculous amount of unneeded and unwanted registered domains.
Domaining as we once knew it is dead. The only reliable way to profit in today's domaining environment is to concentrate solely on .COM domains. Your domains do not meet that criteria. The hotel domain needs a plural to break reg fee and the tricks domain breaks the 14-character rule of domains.
If these were my domains, I would grace delete them and then sit down and rethink my entire domaining strategy. Grace delete, reboot, sanitize your workspace, and try again.
Best of luck and may the force be with you!