I dont think its so bad to do such a thing.
I have my own little Mastering chain that I will usualy apply to my tracks before I send them out or put them on here, If any tracks get taken off me I will send it unmasterd but for sending out ect or even just for my own pleasure when playing the track back I will do my own shit attempt at mastering.
I never do it while im making the track tho, I try to get the mix as good as I can without it(just turning the fukker up realy loud now and then instead I find can help)