Can someone explain the logic of underbidding swap demands?

i.e. placing your swap demand at 0.0999 or one penny bellow that at 0.0998. It's as if you're artificially keeping the demand high while don't really want your demand to be filled

It makes sense for offers where they're underbidding each other, but if anything i'd expect demands to up each other by a penny and placing demands at 1.0001
Prolly people who don't fully understand what they are doing!
I find it very hard to believe that somone who puts a $100k figure swap ask at 0.0999 doesn't know what he's doing or a $350k swap ask just under that @ .099
..maybe they didn't put that 0.0999 after a 0.1 offer was there, but before? And in fact the 0.1 guy overbid the 0.0999 one?
0.09990 14 318.04 19:35:38 10-08-2014
0.09989 100 000.00 20:27:42 10-08-2014
There's at least one who didn't think it hrough, though ;-)
Ente