Picture posting is enabled for all :)
...like you I was planning to only keep the male plants, but have since read somewhere that female plants do produce as many spears, but they don't tend to be as thick. So depending on how many plants I end up with and how much space I have in a year, I may keep them all.
New hybrids are offered that are all male and do not waste energy producing seed. Otherwise there is very little to choose between varieties, and personally I prefer female plants anyway as they give bigger, thicker, more succulent spears