Course it will Anton, most of us are well aware of this fact.
However, you're preaching to the converted with most of the (allnighter) promoters on here, who do speak to each other and attempt to avoid clashes with each others dates.
There are an odd few, however, who don't seem to give a shite about any other events within spitting distance.
As you are quite pally with at least one in particular, maybe your pearls of wisdom would better shared over a pint or two with him instead.......
Then again, you know you're pissing in the wind when this lame excuse rears it's ugly head....
" I had no choice, it was the only date the venue would give me that month"