Ferengi Federation Membership

In the "Lower Decks" episode "Parth Ferengi's Heart Place", viewers are surprised to see Grand Nagus Rom (and his wife Leeta) spearheading efforts for the Ferengi Alliance to join the United Federation of Planets. The trio looks at how Ferengi culture does (and does not) fit into what we understand of the Federation.

From the extremes of capitalism to the "opportunities" available to Federation members, why should the Ferengi join the Federation? Or is it actually a bad deal?