[Brian]

We keep bugging you because until those older client files are removed by a later sync or by nuking them, your sync database won't compact. We keep all the transaction files around all the way back to the least recent sync so we can insert transactions from that machine when it eventually does.

Those extra files make every sync for the machines that *are* synching take longer. If someone that doesn't understand what's going on selected a perma-ignore option, they'd create a situation where their synchs eventually became unbearable; they'd blame OmniFocus, not the checkbox they clicked in the Ignore dialog three months ago.

I'm pretty sure we have a feature request open for nagging less frequently, though; send the ninjas an email if you'd like to add your voice to it.