I've never really enjoyed booksignings. Truth be told, I've never much cared for anything that remotely resembles a schedule. Having to be in a certain place at a certain time, having to stay put for hours at a time...that's very difficult for me. Don't ask me why.
Doing a solo signing can be painfully boring. Unless you're Stephen King, Janet Evanovich, or Stephenie Meyer, you will probably spend a large part of your 2-3 hour stint sitting alone with stacks of your books at a strategically-placed table, looking hopefully at everyone who passes by. If you're lucky, some will stop, chat a bit, and feel sorry enough for you to buy a book.
If you're lucky.
On the other hand, group signings are great fun. You have someone to talk to, and if you'e having fun, that will draw the attention of potential buyers. I was once part of a 21-author signing at a bookstore in a large mall, and we had a blast. We also sold a lot of books that day.
The group was comprised of authors on all levels of success--from big names like Laurell K. Hamilton to newly-published authors hawking their first books. I fell somewhere in the middle of that spectrum: six-figure advances, lead title status (second lead, actually), technically a bestselling novelist, though not in the upper echelons populated by King, Evanovich, Sheldon, Meyer, Steel, Clancy and their peers.
I could make a livng as a writer. I could not buy a villa in Portofino.
But back to the booksigning. We had a ball. Status wasn't a factor in this group. We were all authors, equals, engaging in lively banter and a bit of friendly name-calling. The word "hack" was tossed around in fun.
Booksignings are a necessary evil for the writer who wants to be successful, but if you have the option, don't go it alone. There's saftey--and fun--in numbers!