Question: Tracy Ferrie is the current bass player for a band that sold more than how many records?

Context articles: Scott Firth
Derek Gibbs
Scott Reeder (bassist)
Tracy Ferrie
Tobias Exxel
Strange Celebrity
Stryper
Michael Wittig
Ricky Phillips
Boston (band)

Scott Firth is a British bass guitar player, guitarist and record producer.
 He is the current bass player in Public Image Ltd, playing on their 2012 album, "This is PiL".
 and 2015 album What The World Needs Now.
Derek Gibbs is the current bass player for Reel Big Fish, and the now defunct Forces of Evil and Jeffries Fan Club.
 He was chosen to replace the band's previous bass player Matt Wong, who left the band to spend more time with his family and newborn child.
 Gibbs appeared on the band's tour in support of the album "Monkeys for Nothin' and the Chimps for Free", and also appeared in the music video for "Party Down".
Scott Reeder (born May 16, 1965) is best known as the former bass player of stoner rock bands Kyuss and The Obsessed, as well as the current bass player for Sun and Sail Club.
Tracy Ferrie is an American musician, who is the current bass player for the classic rock band Boston and was the former bass player of Christian metal band Stryper.
 Beginning in 1996, Tracy played bass for Michael Sweet's solo band and was also a member of the bands Electrik, Sally Steele, Seraiah, Whitecross, Guardian, Rebecca St. James, Plumb, Sonicflood and Strange Celebrity.
 He is from Elkhart, Indiana and a national roller skating champion.
Tobias "Eggi" Exxel (born 27 February 1973) is the current bass player for the power metal band Edguy.
 Tobias was hired by Edguy in 1998 when vocalist Tobias Sammet, who had played bass since the band's formation in 1992, decided the band should have someone who could focus on playing the instrument full-time.
Strange Celebrity was a Christian rock band, formed in Nashville, Tennessee, composing of four members: Luke Brown (lead vocals, guitar), Rick Wilson (drums), Quinton Gibson (guitar), and Tracy Ferrie (bass guitar).
 The band is now defunct, as Luke Brown has pursued a solo career.
Stryper is an American Christian metal band from Orange County, California.
 The group's lineup consists of Michael Sweet (lead vocals, guitar), Oz Fox (guitar), Tim Gaines (bass guitar), and Robert Sweet (drums).
 In 2004, Gaines left the band and was replaced by Tracy Ferrie (bass guitar) but rejoined in 2009, only to be fired after tension between the band, Gaines and his new wife.
Michael Richard Wittig (born August 21, 1976) is an American Christian musician who is best known as "Kalel", the current bass player for the Dove Awards winning and Grammy nominated Christian hard rock band Pillar.
 After ten years of playing with Pillar, Wittig left the band in September 2008.
 He then later returned to the band in 2012.
 He was also a member of pop rock band Stars Go Dim, with Joey Avalos, Lester Estelle Jr. (former drummer for Pillar) and Chris Cleveland till 2012.
Ricky Lynn Phillips (born October 7, 1952) is an American bass guitarist and the current bass player for the rock band Styx.
 He has also played in Nasty Habit, as a member of The Babys and Bad English, and with Coverdale-Page and Ted Nugent.
Boston is an American rock band from Boston, Massachusetts, that achieved their most notable successes during the 1970s and 1980s.
 Centered on guitarist, keyboardist, songwriter, and producer Tom Scholz, the band is a staple of classic rock radio playlists.
 Boston's best-known works include the songs "More Than a Feeling", "Peace of Mind", "Foreplay/Long Time", "Rock and Roll Band", "Smokin'", "Don't Look Back", and "Amanda".
 They have sold more than 75 million records worldwide, including 31 million albums in the United States, of which 17 million were from their self-titled debut album and seven million were for their second album, "Don't Look Back".
 Altogether, the band has released six studio albums.