Comment 2 for bug 1427444

Yes it looks like the manpage should be updated.
The removal of the .gramps directory is not necessary to reproduce it. Basically, if gramps is run with the -i option without specifying a database to import into with the -o option, a new database is created with the name "Family Tree 1". If you do the same command again, a new database is created called "Family Tree 2". These databases are not temporary, and do not get deleted (which I think is a desirable behaviour!).