so i just wanted to point out that there is the potential for some small amount of information to be leaked by people using very specific mixin values. for example, for 2 transactions which both used a mixin value of 23 might be surmised that its more likely than a random sample that these two transactions were initiated by the same party. standardized mixin denominations offering a range of options might be preferable. 3, 5, 7, 10, 15, 20, 25, 30, 35, ect.... (just as an example) plenty of flexability there. its unlikey that someone who wants more than 20 mixin couldnt be happy with 25 and would feel very strongly that they wanted 22 very specifically. so in this way there would be little cost to the user in inconvenience, but potentially reasonable gain to the privacy of the network for that very small inconvenience cost.
It's a good idea but people are probably going to do that anyway I would think. Who is actually going to use 23 as opposed to 20 or 25.
Because it's their favorite number
But lets keep this one as clean as we can. 
