Background: Exile, originally known as The Exiles, is an American band founded in Richmond, Kentucky, by J.P. Pennington. They started by playing local clubs which led to touring with Dick Clark's Caravan of Stars opening shows and providing backup for major rock artists of the period. Their name was shortened to Exile in 1973, consisting of guitarist Pennington, leader/lead singer Jimmy Stokley, Bernie Faulkner B3 sax acoustic guitar, Billy Luxon trumpet, keyboardist Buzz Cornelison, bassist Kenny Weir, and drummer Bobby Johns.
Context: In 1963, a group of high school students started a rock and roll band in Richmond, Kentucky. They called themselves the Exiles. Those original Richmond Exiles were Jimmy Stokley, Ronnie 'Mack' Davenport, Paul Smith, Mike Howard, Billy Luxon, J.P. Pennington, and Buzz Cornelison. Richmond native Danny Williams was also a member in the 1960s. Their chosen name may have resulted from the influx of Cubans into the United States after the Fidel Castro takeover in 1959. According to original Exile Pennington, "There were a lot of Cuban exiles coming across...the word was in the news and we felt we were also somewhat ostracized from the local society. We had long hair back then..."  Most of the Exiles were students at Madison Central and Madison High School in Richmond when the band formed and played together from 1963 to 1965. They were an offshoot of Ronnie (Hall) and the Fascinations. They were briefly known in those early years as Jimmy Stokley and the Exiles. Stokley (18 October 1943 - 13 August 1985) was the lead singer of the group and continued in that capacity until 1979. It is Stokley's lead voice that is prominent on Exile's 1978 Billboard pop music chart-topper, "Kiss You All Over".  When the Dick Clark Caravan Of Stars hit the road in 1965, they picked up the Exiles to perform on several dates in and around Kentucky. They continued touring nationally with the Caravan of Stars through to 1968; opening the show and providing back-up for headlining stars like Freddy Cannon, B. J. Thomas, Paul Revere and the Raiders and others.  In the early 1960s the Exiles recorded their first record in the studios of WEKY Radio Station in Richmond. Side one was named "The Answer to Her Prayers" written by Paul Smith, Jr. and the back side was called "Come On". The recording was produced by WEKY Radio DJ" Jimmy K" (Kincer) on his own record label "JIMBO Records". In the late 1960s, they recorded for both Date Records and Columbia Records, and in the early 1970s for SSS International, Date, Curb and Wooden Nickel record labels. With the help of Cecil Jones of Lemco Sound Studios in Lexington, the Exiles developed and polished their sound. The band scored regional hits such as "Devil's Bite" and "Church Street Soul Revival" (written and produced by Tommy James).
Question: Why did they record for both?

Answer:
the Exiles developed and polished their sound.