Frasier writer Joe Keenan has addressed an apparent plot hole that has long irked many fans.The comedy series is due to return to screens this month after nearly two decades off air, with Kelsey Grammer back as therapist Frasier Crane.One point that many viewers have questioned over the years is how the character became so wealthy on a local radio presenter’s salary, notably given his lavish apartment, and taste for expensive sherry and designer suits.“The question has come up,” Keenan told Metro, before explaining: “We think Frasier made a lot of money in private practice in Boston, and he has investments. What we imagined to be the salary of a local radio personality was perhaps a little bit inflated.”He further noted of Frasier’s brother Niles’s lifestyle: “On the other hand, when you looked at Niles and his house with Maris, this baronial mansion that Niles lived in, Frasier’s apartment didn’t seem all that…“In addition to it, we’ve lived on that set, and it wasn’t that big when you actually stepped onto [it].