Since I already have 9x19mm,9mm MAK, 45acp, 38spl, & 357mag, I find that all my bases are covered and anything in 40S&W would be redundant for me.
I am sure alot of people do accomodate for what ever calibers they want but, I find, esspecially with the current cost of ammo, that 40S&W will not do anything that my 9's and 45's don't do already. YMMV