Ability to updgrade an existing ad
Currently once a poster puts up an ad, they can't go back and "upgrade" it if they want bold/highlight/italic. If they want those features they'd have to post a whole new ad.
My suggestion is to enable the ability for a poster to go into their existing ad and upgrade it with bold, highlite or italics (or other upgrades that might be added in the future.)
It might encourage more upgrades (and therefore additional $$ revenue,) if this was available, since most folks won't want to go through the hassle of finding the pictures they orginally posted, writing the ad again, or even copying and pasting it.