Simple math: 24,000 glimmer to buy all 5 maps. Maximum return from Cayde on returning items approx 1,000 glimmer for each one, plus dismantled gear materials, say... about 5.5k return on investment. So unless you've 'money' to burn... Save it to buy mods. Or apply some of the better shaders.

Oh, I thought you we're supposed to sometimes get nothing. It was the gamble of getting something good. Because if i'm not mistaken he does say something along the lines of "It's all there, probably..." or "No Refunds" indicating that it's not that reliable of a source just like Cayde-6 is.