I am not saying it's right and I generally don't do it myself but some sellers find it easier to keep track of stuff if they are all in separate ads.

Internet analysis: 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact

Fools & fanatics are always so certain and wise people are always so questioning

[Linked Image from i.imgur.com]