only on FT will you find crazy people like this yes people obviously think it's worth it because the miles that they earn will get them upgrades and access to lounges, and redeem miles for trips to exotic places like Africa that otherwise would cost a lot of money.

Depending on where you're going you can do same day returns. For example you can take a red eye from SEA to BUF via MSP/DTW and back all in one day. It really depends on timing of flights but alot of international/overseas trips will require a night stay. However, there are stories where people for example fly Chicago to Tokyo and change planes back to Chicago. most recently a crazy routing includes the following. SFO-HNL-LAX-SYD-LAX-HNL-SFO all for like less than $600 back to back to back..or whatever you want to call that